12)50 students took a quiz with five questions. The frequency table below shows the results of the quiz. Use the frequency table to answer the following questions. ValueFrequencyRelative FrequencyCumulative Frequency040.084180.1612260.1218320.04204150.3355150.350a)How many students answered exactly 3 questions correctly?Number of students answered exactly three questions = 2b)How many students answered less than 3 questions correctly?c)What proportion (percent) of students answered exactly 4 questions correctly?
Answers
From the table, we have:
• The first column (Value),: indicates the # of correct answers,
,• The second column (Frequency),: indicates the # of students that answer the # of correct answers to the left in the table,
,• The third column (Relative Frequency),: indicates the proportion of the # of students to the total,
,• The fourth column (Cumulative Frequency),: gives the sum of the previous frequencies up to that row.
Using these data, we answer the questions:
a) Looking at the column Frequency for Value = 3, we find that 2 students answered exactly 3 answers correct.
b) Looking at the column Cumulative Frequency for Value = 2 (the previous value to 3), we find that 18 students answered less than 3 questions correctly.
c) Looking at the column Relative Frequency for Value = 4, we find that 0.3 = 0.3 * 100% = 30% of the students answered exactly 4 questions correctly.
Answera) 2
b) 18
c) 30%
Related Questions
Un establecimiento vendía café a 5€/kg. Si ahora lo vende a 4,75€/kg, obtener el porcentaje de descuento aplicado. Porfavor es para dentro de 1 hora
Answers
El porcentaje del descuento aplicado es del 5%.
¿Como encontrar el porcentaje del descuento aplicado?
Recordar que si aplicamos un descuento de X (sería un porcentaje X) a un precio P, entonces el nuevo precio será:
P' = P(1 - X/100)
En este caso, sabemos que el precio origina es 5€ por kilo, y el precio nuevo es 4.75 € por kilo, reemplazando esos numeros en la ecuación de arriba obtenemos:
4.75 = 5*(1 - X/100%)
4.75/5 = 1 - X/100%
X/100% = 1 - 4.75/5
X = (1 - 4.75/5)*100%
X = 5%
Fue un descuento del 5%.
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9x + 3y = 14 what is y
Answers
When something is NOT stated explicitly in a text, and a reader has to use evidence in the text to figure out the meaning, it is called _____.
.jumping to a conclusion
.making an inference
.searching for connotations
.creating mental pictures
Answers
Answer:
making an inference is the correct answer.
Step-by-step explanation:
fills a 50gallon fish tank completely with water only to find that it has a
leak in the bottom. The leak is draining one gallon of water every two hours. Write an
equation that shows how many gallons of water are left in the tank:
Answers
The equation that shows the amount of water in gallons remaining in the water tank in terms of time t is A = 50 - t/2.
How to form an equation?Determine the known quantities and designate the unknown quantity as a variable while trying to set up or construct a linear equation to fit a real-world application.
As per the given,
Amount of water initially = 50 gallons
Leakage of water in 2 hours = 1 gallon.
Leakage in t hour = t/2 gallons.
Thus,
Amount = 50 - t/2
A = 50 - t/2
Hence "The equation that shows the amount of water in gallons remaining in the water tank in terms of time t is A = 50 - t/2".
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which value of R makes the right side of the equation equal to 27,000?a)210,000b)220,000c)200,000d)183,000
Answers
Given:
The equation is
[tex]27000=R-183000[/tex]Find-:
The value of "R."
Explanation-:
The "R" is
[tex]\begin{gathered} 27000=R-183000 \\ \\ 27000+183000=R-183000+183000 \\ \\ R=210000 \end{gathered}[/tex]The value of "R" is 210000.
So, the expression is:
[tex]\begin{gathered} 27000=R-183000 \\ \\ 27000=210000-183000 \\ \\ 27000=27000 \end{gathered}[/tex]help meeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Answers
Answer: 2.5, 5.3
Step-by-step explanation:
[tex]-16t^2 +126t=217\\ \\ 16t^2 -126t+217=0\\\\t=\frac{-(-126) \pm \sqrt{(-126)^2 -4(16)(217)}}{2(16)}\\\\t \approx 2.5, 5.3[/tex]
You deposit $1575 in a bank account that earns 3.75% interest per year for 5 years. How much will the balance be if it's compounded continuously?
Answers
the answer is $1899.81
Which of the following is the average rate of change over the interval [−3, 0] for the function g(x) = log2(x + 4) − 5? (2 points)
Answers
The average rate of change of g(x) on the interval [-3, 0] is r = 2/3.
How to get the average rate of change?
For any function f(x), we define the average rate of change on an interval [a, b] as:
r = ( f(b) - f(a))/(b - a)
In this case, the interval is [-3, 0], and the function is:
g(x) = log₂(x + 4) - 5
Replacing that in the average rate of change formula, we get:
r = ( g(0) - g(-3))/(0 + 3)
g(0) = log₂(0 + 4) - 5 = -3
g(-3) = log₂(-3 + 4) - 5 = -5
Replacing that:
r = (-3 + 5)/3 = 2/3
The average rate of change is 2/3.
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how do we do this one its one quiestion two parts
Answers
Answer:
Volume = 5861.64 cubic inches
Explanation:
We were given that we should make an open rectangular box from a cardboard of dimension 25 inches by 49 inches
We are to cut congruent squares from the corners and folding up the sides
The box is open at the top
We will proceed to solve as shown below:
[tex]\begin{gathered} Length=49in \\ Width=25in \\ \text{Taking a unit of square from each side, we have:} \\ New\text{ }Length=49-2x;x<24.5 \\ New\text{ }Width=25-2x;x<12.5 \\ Height=x \\ \text{So, the doamin of this is \lparen0, 12.5\rparen} \\ V(x)=x(49-x)(25-x) \\ V(x)=x^3-74x^2+1225x \\ \text{Taking the derivative of both sides, we have:} \\ V^{\prime}(x)=3x^2-148x+1225 \\ Equate\text{ }V^{\prime}(x)\text{ to zero, we have:} \\ 3x^2-148x+1225=0 \\ \text{Solving using quadratic formula, we have:} \\ x=38.81273011,10.52060321 \\ Either\text{ of these two values is either the maximum or minimum} \end{gathered}[/tex]We will proceed as shown below:
[tex]\begin{gathered} x=38.81273011,10.52060321 \\ \text{Take a second derivative. The maximum point is the point where x returns a negative value, we have:} \\ V^{\prime}(x)=3x^2-148x+1225 \\ V^{^{\prime}}^{\prime}(x)=6x-148 \\ \text{We substitute both values into this, we have:} \\ when:x=38.81273011 \\ V^{\prime}^{\prime}^(x)=6(38.81273011)-148 \\ V^{\prime\prime}(x)=84.87638066 \\ when:x=10.52060321 \\ V^{\prime\prime}(x)=6(10.52060321)-148 \\ V^{\prime\prime}(x)=-84.87638074 \\ \text{Therefore, the value of the height that gives the greatest volume is 10.52060321 inches} \end{gathered}[/tex]Hence, the maximum volume is given by:
[tex]\begin{gathered} x=10.52060321 \\ V(x)=x^3-74x^2+1225 \\ V(x)=5861.64in^3 \end{gathered}[/tex]Answer:
5.26 in × 14.48 in × 38.48 in
2930.82 in³
Step-by-step explanation:
You want the dimensions and volume of the maximum-volume open-top box that can be made from 25 in by 49 in stock when congruent squares are cut from the corners.
DimensionsIf the side length of the square is x, then the dimensions of the base of the box are (25 -2x) and (49 -2x) inches.
VolumeThe volume of the box is the product of the dimensions:
V(x) = x(25 -2x)(49 -2x) = 4x³ -148x² +1225x
Maximum volumeThe maximum volume will be had when x is such that the derivative of volume with respect to x is zero. The maximum value of x cannot be as great as 25/2 = 12.5 because that value gives a zero-width box.
V'(x) = 12x² -296x +1225 = 0
Final dimensionsUsing the quadratic formula, we find the relevant value of x to be ...
[tex]x=\dfrac{-b-\sqrt{b^2-4ac}}{2a}=\dfrac{-(-296)-\sqrt{(-296)^2-4(12)(1225)}}{2(12)}\\\\=\dfrac{296-\sqrt{28816}}{24}=\boxed{\dfrac{74-\sqrt{1801}}{6}\approx 5.2603}[/tex]
Then the dimensions are ...
x ≈ 5.2603
25 -2x ≈ 14.4794
49 -2x ≈ 38.4794
The box is about 5.26 inches by 14.48 inches by 38.48 inches.
Largest volumeThe volume of the final box is about ...
(5.2603 in)(14.4794 in)(38.4794 in) ≈ 2930.82 in³
The volume of the finished box is about 2930.82 cubic inches.
__
Additional comment
As the attachment shows, a graphing calculator can show the extreme value(s) of the volume function, and the corresponding box dimensions.
Thirty increases by a number t.
Write a variable expression for the word problem
Answers
Answer:
30 + t;
Step-by-step explanation:
Thirty increases by a number t.
This means 30 is more than t, therefore (so), 30 + t.
Can somone please help me with this, find x.
Answers
Answer:
11. x=13; 12. x=30; 13. 9
Step-by-step explanation:
how many quarts are in 12 pints
Answers
Answer:
6
Step-by-step explanation:
12/2=6
Using the graph as your guide, complete the following statement.
The discriminant of the function is
• A. negative
• B. zero
• C. positive
Answers
Answer:
B. Negative
Step-by-step explanation:
A discriminant of zero indicates that the quadratic has a repeated real number solution. A negative discriminant indicates that neither of the solutions is a real number.
You deposited $3,000 in the bank in 2019. It is compounded annually at 4%. How much money will you have in 9 years (in 2028)?
Answers
ANSWER
[tex]\begin{equation*} \$4,269.94 \end{equation*}[/tex]EXPLANATION
To find the amount of money that you will have in 9 years, apply the formula for annually compounded amount:
[tex]A=P(1+r)^t[/tex]where P = principal
r = interest rate
t = number of years
Hence, the amount after 9 years is:
[tex]\begin{gathered} A=3000(1+\frac{4}{100})^9 \\ A=3000(1+0.04)^9=3000(1.04)^9 \\ A=\$4,269.94 \end{gathered}[/tex]That is the answer.
use formula of boolean 1+1
Answers
Answer:
i know i answered this but a mod must have got rid of it it is 1
Step-by-step explanation:
Factor completely 3x^2+9x-54
Answers
Answer:
(3x+18)(x-3)
Step-by-step explanation:
3x^2 + 9x - 54 = 0
x^2 + 3x - 18 = 0
(x+6)(x-3) = 0
x = -6
x = 3
3(x-(-6)(x-3)
3(x+6)(x-3)
(3x+18)(x-3)
If P = (-1,5), Find:Ry=1 (P)([?], []).
Answers
The line y = 1 is a horizontal line and thus is a line that is parallel to the x-axis.
If we reflect about a line that is parallel to the x-axis, then the x-coordinate of the point (that is reflected) will remain the same, thus the image of (-1, 5) has x-coordinate -1 and thus the point is of the form (-1, b).
The point (-1, 5) is 4 units from the line y = 1 (because the difference between y = 5 and y = 1 is 4).
The reflected point has to be the same distance from the line y = 1 as the original point
Please help on this, it's like for maths
Answers
Answer:
1.48
Step-by-step explanation:
Subtract 14 from 32 giving us 18. Showing us that 18 is the amount of girls in the class.
Then do 32 x 1.515 which gives us 48.48
multiply the 14 x 1.56 = 21.84
then do 48.48 - 21.84 =26.64
then do 26.62 divided by 18
which gives us 1.48.
find the area of the triangle, carry your internediate computations to at least four decimal places round your answer to the nearest tenth
Answers
Heron's formula is defined as:
[tex]\begin{gathered} A=\sqrt[]{s(s-a)(s-b)(s-c)} \\ \text{where} \\ a,b,\text{ and }c\text{ are the three sides of the triangle} \\ s=\frac{a+b+c}{2} \end{gathered}[/tex]Given: sides with length 12 yd, 14 yd, 15 yd.
Then
[tex]\begin{gathered} s=\frac{12+14+15}{2} \\ s=\frac{41}{2} \\ s=20.5\text{ yd} \end{gathered}[/tex]Plugin the following values to Heron's formula and we get
[tex]\begin{gathered} A=\sqrt[]{s(s-a)(s-b)(s-c)} \\ A=\sqrt[]{20.5(20.5-12)(20.5-14)(20.5-15)} \\ A=\sqrt[]{20.5(8.5)(6.5)(5.5)} \\ A=78.926785694085\text{ yd}^2 \\ \text{Rounded this off to the nearest tenth and we get} \\ A=78.9\text{ yd}^2 \end{gathered}[/tex]Two concentric circles are shown. The length of the arc MN is 4π cm and the length of the arc RE is 8π cm.Which statements are correct? Select all that apply.ere to searchThe radius of the larger circle is 16 cm.The radius of the smaller circle is 16 cm.
Answers
We can express the length of an arc as a fraction of the circumference.
This fraction is equal to the the proportion between the measure of the arc and the full circle measure.
In this case, the measure is 45°, so the fraction should be:
[tex]\begin{gathered} \alpha=45\degree \\ \Rightarrow f=\frac{\alpha}{360\degree}=\frac{45\degree}{360\degree}=0.125 \end{gathered}[/tex]Then, we can express the arc MN as:
[tex]MN=C_1\cdot f[/tex]where C1 is the circumference of the smaller circle.
We can express then calculate it as:
[tex]\begin{gathered} MN=C_1\cdot f \\ C_1=\frac{MN}{f}=\frac{4\pi}{0.125}=32\pi \end{gathered}[/tex]As the circumference can be related to the radius, we can us this value to calcualte the radius of the smaller circle:
[tex]\begin{gathered} C_1=2\pi r_1 \\ r_1=\frac{C_1}{2\pi}=\frac{32\pi}{2\pi}=16 \end{gathered}[/tex]Then, the small circle has a radius of 16 cm and a circumference of 32π cm.
We can then calculate C2 and r2 for the bigger circle as:
[tex]\begin{gathered} RE=C_2\cdot f \\ C_2=\frac{RE}{f}=\frac{8\pi}{0.125}=64\pi \end{gathered}[/tex][tex]\begin{gathered} C_2=2\pi r_2 \\ r_2=\frac{C_2}{2\pi}=\frac{64\pi}{2\pi}=32 \end{gathered}[/tex]The bigger circle has a radius of 32 cm and a circumference of 64π cm.
We can now calculate the length of the segments NE and MR. Both are equal and can be calculated as the difference between the radius of the bigger circle (r2) and the radius of the smaller circle (r1):
[tex]NE=MR=r_2-r_1=32-16=16[/tex]Both segments, NE and MR, have a length of 16 cm.
We can now check the statements. The ones that are true are:
• The radius of the smaller circle is 16 cm.
,• The length of the segment MR is 16 cm.
,• The circumference of the larger circle is 64π cm.
Answer: The true statements are
• The radius of the smaller circle is 16 cm.
,• The length of the segment MR is 16 cm.
• The circumference of the larger circle is 64π cm.
Jason sold 2/3 of his baseball card collection. What is this amount as a decimal?
Answers
Answer:
ABOUT 0.6666666666666666667
Answer: The 2/3 fraction as a decimal is 0.666666666667
The amount of cards as a decimal is unknown (need quantity info)
Step-by-step explanation:
The 2/3 fraction in decimal form can be rounded to the proper degree of precision (such as .67 for hundredths).
Casho is trying to find the height of a radio antenna on the roof of a local
building. She stands at a horizontal distance of 26 meters from the building.
The angle of elevation from her eyes to the roof (point A) is 32°, and the
angle of elevation from her eyes to the top of the antenna (point B) is 36°. If
her eyes are 1.75 meters from the ground, find the height of the antenna (the
distance from point A to point B). Round your answer to the nearest meter if
necessary.
Answers
Distance from point A to point B is approx. 3m
What is the difference between Distance and Displacement?
While distance and displacement appear to signify the same thing, they actually have very different definitions and meanings.
A scalar quantity known as distance measures "how much ground an object has traversed" while moving.
An object's total change in position is referred to as displacement, a vector variable that measures "how far out of place an object is."
Distance is the sum of an object's movements, regardless of direction. Regardless of an object's starting or ending position, distance can be defined as the amount of ground it has covered.
The term "displacement" refers to a shift in an object's position. It is a vector quantity with a magnitude and direction. The symbol for it is an arrow pointing from the initial location to the ending place. For instance, if an object shifts from location A to position B, its position changes. Displacement is the term used to describe this shift in an object's position.
∠BCD = 36°
∠ACD = 32°
CD= 26m
tan∠BCD=0.726
tan∠ACD=0.624
since,
BD=CD x tan∠BCD
AD=CD x tan∠ACD
thus,
AB = BD-AD
= CD x tan∠BCD - CD x tan∠ACD
= CD x [0.726 - 0.624]
= 2.652
= approx 3 m
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Answer:
3(m)
Step-by-step explanation:
00:00 How many solutions does the equation below have? 2x – 7 + 19 = 6x - 4x + 12 No solution, 1 solution, 2 solutions, Infinitely many solutions
Answers
The last equallity is false! Because 0 IS NOT equal to 24, and thus the initial equation has no solution!!!
you invest $1500 for three years. find the amount of simple intrest you earn at an annual rate of 8.25%
Answers
Answer:
simple interest=371.25
Step-by-step explanation:
1500×8.25%×3
=123.75×3
=371.25
Answer:
371.25
Step-by-step explanation:
interest = principal x rate (expressed as a decimal, annual) x time (years)
our principal is 1500, and 8.25% as a decimal is 0.0825, and then its 3 years, multiply that all up and that equals 371.25
How to find the area of a semi-circle
Answers
The area of a circle is given by:
[tex]\begin{gathered} A=\pi r^2 \\ where \\ r=radius \end{gathered}[/tex]Therefore, the area of a semicircle is:
[tex]A_s=\frac{\pi r^2_{}}{2}[/tex]A 20-oz bottle of shampoo cost $2.90. A 12-oz bottle costs $1.35. Which is the better buy?
Answers
The price of each ounce of shampoo for the 20-oz bottle is:
[tex]\frac{2.90}{20}=0.145.[/tex]And the price of each ounce of shampoo for the 12-oz bottle is:
[tex]\frac{1.35}{12}=0.1125[/tex]Answer: The 12-oz bottle is the best buy.
what is linear functions and what is non linear functions
Answers
Linear functions: Are the ones represented by a line in a graph. Their characteristic is that their equation has the form:
[tex]f(x)=mx+b[/tex]Where m is the slope of the line, and b is the y-intercept of the line.
Some examples of linear functions:
[tex]\begin{gathered} f(x)=3x+2 \\ f(x)=-10x-5 \\ f(x)=9x \end{gathered}[/tex]And some examples of graphed linear functions:
Non-linear functions: Are the functions that have an exponent on the x different from 1, and they are not represented by lines.
Some examples of non-linear functions:
[tex]\begin{gathered} f(x)=x^3+1 \\ f(x)=\frac{1}{x} \end{gathered}[/tex]And some examples of graphed non-linear functions:
Are the ratios 5:2 and 15:6 equivalent?
Answers
Answer:
Yes
Step-by-step explanation:
5 x 3= 15
2 x 3= 6
Since they are multiplied by the same number to get to 15/6 they are equivalent fractions
Are this triangles similar?
Answers
Answer: yes
Step-by-step explanation:
yes
Tonya spends 55% of her savings on a new dress. If she saved $120, how much was the dress?
Answers
Answer: The dress was $66
Step-by-step explanation:
55(120) divided by 100 and you'll get the price of the dress :)