The length of life of oil-drilling bits depends upon the types of rock and soil that the drill encounters, but it is estimated that the mean length of life is 55 hours. An oil exploration company purchases drill bits that have a length of life that is approximately normally distributed with mean equal to 55 hours and standard deviation equal to 9.1 hours.
What proportion of the company’s drill bits will have to be replaced after more than 90 hours of use?

Answers

Answer 1

Answer:

"0.9999" is the correct solution.

Step-by-step explanation:

The given values in the question are:

Mean,

= 55

Standard deviation,

= 9.1

Now,

⇒ [tex]z=\frac{X-mean}{sd}[/tex]

By putting the values, we get

⇒    [tex]=\frac{90-55}{9.1}[/tex]

⇒    [tex]=\frac{35}{9.1}[/tex]

⇒    [tex]=3.8461[/tex]

hence,

[tex]P(X<90)[/tex]

= [tex]P(Z<3.8461)[/tex]

= [tex]NORMSDIST(3.8461)[/tex]

then the value will be:

= [tex]0.9999[/tex]


Related Questions

Observe the following graph:

What is the exact value of cos0

Answers

Answer:

(Sqrt)2/2

Step-by-step explanation:

Josh likes to play an outdoor beanbag toss game in his spare time. On any toss, he has about a 30% chance of getting a bag into the hole. As a challenge one day, he decides to keep tossing beanbags until he makes it. Starting on line 5 of the random number table, how many times does Josh have to toss the beanbag in order to make it in the hole if we let success = 0–2 and failure = 3–9?

Answers

Answer:

B

Step-by-step explanation:

Angle Relationships

For the triangle above, find sin B.

a. 25°
b. 0.385
c. 0.923
d. 18°

Please select the best answer from the choices provided

Answers

Answer:

c

Step-by-step explanation:

12/13=0.923 , and also sinb is ac/ab

Answer:

C. 0.923

Step-by-step explanation:

I calculated it logically

Mrs. Clark has 7 candy bars to share equally with all the students in his class. He gives each student 1/4 of a bar. None of the chocolate bar is left over. How many students does he have in his class?

Answers

Answer:

28

Step-by-step explanation:

7×4

aaaaaaaaaaaaaaa

1.4 and its solved by the percentage of the 7

Write 0.0000000000048 as a multiple of a power of 10.

Answers

0.0000000000048

48 x 10^-13

Answer:

4.8 x 10^-13

hope this helps

have a good day :)

Step-by-step explanation:

8y - (5y + 13 ) = -7​

Answers

Answer:

y=2

Step-by-step explanation:

8y-5y-13=-7

3y-13=7

3y=-7+13

3y=6 /3

y=2

Which equation represents the data in this function table?


A. y = x + 4
B. y = x - 4
C. y = 4x
D. x = y + 3

Answers

Answer:

A.

Step-by-step explanation:

If you put the x value of the table and use it in each equation, only one gives the y output on the table.

y=x + 4

5=1 + 4

6=2+4

7=3+4

8=4+4

9=5+4

The correct option is A) y=x+4

What are linear equations?

Linear equations help in representing the relationship between variables such as x, y, and z, and are expressed in exponents of one degree. In these linear equations, we use algebra, starting from the basics such as the addition and subtraction of algebraic expressions.

Given here option A as y=x+4 now lets verify this option

if x=1 then y = 1+4

                    = 5

Again if x=2 then y =2+4

                               =6

Similarly it can be clearly observed that all the values of y are 4 greater than the input of x given in the table.

Hence, option A is the correct answer.

Learn more about linear equations here:

https://brainly.com/question/29739212

#SPJ2

A middle school coach wrote down the time, in seconds, of her students’ 100-meter dash as shown in the table. Student Time -(seconds … ) Gary 11.9 Rick 12.3 Phillip 13.5 Jorge 12.0 Robert 12.3 Jeremy 16.0 If the slowest time and the fastest time are removed from the data, how does the new mean compare to the mean of the ..

Answers

Answer:

D. The mean would decrease as there is less variability in the data.

Step-by-step explanation:

So, let’s find the mean with all of those numbers. First of all we should order them from least to greatest.

11.9, 12.0, 12.3, 12.3, 13.5, 16.0

We add them all up, and get 78! Once we get this total, we must divide it by how many numbers there are! There are six numbers, so 78/6.

78/6 is equal to 13. So the mean for all those numbers is 13.

Now let’s find the mean if we cross out the greatest and least numbers, the greatest number is 16.0, and the least number Is 11.9.

So, our new data set is:

12.0, 12.3, 12.3, 13.5

Add those all up to get 50.1

Divide the total by the numbers we got left, which is 4!

50.1/4 is equal to 12.525.

So the mean of our new data set is 12.525!

So that’s how I got the answer, have a nice day! Please tell me if I’m wrong!

12.525 < 13

Determine the greatest common factor of 28xy9z and 32x2y2z

Answers

Answer:

4xy^2z

assuming those numbers after the first ones are exponents

Find the volume of the right cone shown as a decimal rounded to the nearest tenth

Answers

Answer:

375π

Step-by-step explanation:

Volume of a cone = 1/3πr²h

Radius, r = 10/2 = 5

Height, h = 45

Volume V = 1/3 * π * 5² * 45

V = π * 25 * 15

V = 375π

Help please!!!!!! As soon as possible

Answers

(-3,2) for middle and 4 for radius. Radius is the distance from the center to the circle. So you can count with the units on the grid. Hope this helps!!

-7, -3, 1, 5 what is the explicit formula

Answers

Answer:

f(x)=4x-11

Step-by-step explanation:

This is a linear sequence, so we have to find our common difference, or slope, by finding the difference between any term and its previous term. We should do this a couple of times to make sure it's consistent. In this case, our slope is 4 and our first term is -7. We can do our equation in slope intercept (y=mx+b) form. However, to do this, we have to find the '0'th' term, or the term where x=0, a.k.a. the y-intercept. Our 1st term where x-1 is -7, and since our common difference is 4, we subtract 4 from negative 7 to get a y-intercept of -11. Our equation is now y=4x-11. To make this an explicit formula, we convert into f(x) form to get a formula of f(x)=4x-11.

Which values of a, b, and c correctly represent the answer in simplest form? 6 al- o a=1,0-5,0-9 a= 10,5= 18.0= 1 a=9,0-5,0- 1 a= 1,5= 10 0= 18​

Answers

Answer:

The question is not explained well, Please explain it better or take a screenshot or something

Step-by-step explanation:

Name the solid figure formed by the net.
1
A Cube
B Cuboid
c Cylinder
D
Cone

Answers

u didn’t give a picture

What shows a example of symmetry?

Answers

Answer:

symmetry is a mirror image

Step-by-step explanation:

all it really is if you were to cut it in half would one side match the other

Answer:

Square

Step-by-step explanation:

If you cut it any where it will become symmetrical

Solve for x. Need it by today.

Answers

Alright, so a circle is 360 degrees. We know there's an arc of 90 and an angle extending from the radius being 125.

Since the given angle extending from the radius is at the radius, there will also be a 125 degree arc at the circumference of the circle there.

With this, do:

360-90-125 = 145

to get the amount of arc in the unknown area.

Still though, we need to find the x value, so get the unknown value and set it equal to 145.

16x + 1 = 145

16x + 1-1 = 145-1

16x=145

x = 9.0625 or 9 1/16

Hope that helps.

A right rectangular prism with dimensions of 2 cm 5 cm and 10 cm is shown.
5 cm
2 cm
10 cm
* diagram not drawn to scale
What is the volume of the prism?

Answers

Answer:

What is the similar in the United States to the Canadian Charter of Rights and Freedoms?

Step-by-step explanation:

Volume= Length x Width x Height

though it does not have a diagram in this situation it does not matter the order you put the numbers in. any way you multiply them you will get the same answer/volume.

10cm x 5cm x 2cm=100cm^3

Hope this helps!

Under her cell phone plan, Rajani pays a flat cost of $65 per month and $5 per gigabyte. She wants to keep her bill under $85 per month. Write and solve an inequality which can be used to determine gg, the number of gigabytes Rajani can use while staying within her budget.

Answers

Answer:

gg ≤ 4

Step-by-step explanation:

Total cost(gg) = $65 + ($5/mo)(gg)  =  $85

Ths reduced to $85 - $65 =  ($5/mo)(gg), which returns gg = 4

The correct answer is an inequality:  gg ≤ 4

Answer:

Inequality = 5g+65<85 Anwser = g<4

Step-by-step explanation:

The number six and twelve-hundredths in decimal numbers?

Answers

Answer:

12.06

Step-by-step explanation:

What’s the correct answer?? I will mark as brainlest

Answers

Im pretty sure it’s 8

I’m so sorry if I’m wrong… I hope u have a good day

What is the probability of getting 5 baskets ina row out of 10 shots

Answers

The probability would be 50%

What is 94.53 ÷ 2.3?
O 41.1
O4.11
O 411
O 0.411​

Answers

It’s 0.441 just really got to read it right that’s all

Dividing fractions
7/10 2

Answers

7/10 : 2 = 7/20 = 0.35

Answer:

yeah it's 0.35 I agree with the other guy

How can you evenly split 8 apples among 15 people without cutting any apple into more than 5 parts?

Answers

Answer:

1/3 and 1/5

Step-by-step expl1

u should kno

A pair of dice was rolled many times
and the results appear below. Based
upon these results, what is the
experimental probability of rolling a 2?
Outcome
2
3
3
4
5
6
7
8
9
10
11
12
Frequency
3
6
00
11
14
16
15 12
9
5
1
The percent probability is = [ ? ]%
Round to the nearest percent.
Enter

Answers

I think that would be 16

Find the y-intercept and the axis of symmetry of f(x) = ax2 – 6ax +2.
The y-intercept is
and the axis of symmetry is x=

Answers

The axis of symmetry is x=3, and the y-intercept is 2.

Some one help will give brain

Answers

Answer:

what the link? didfbdsfaahsdfhsd

Step-by-step explanation:

¿Cuál de las siguientes respuestas es equivalente a 3 decámetros? Hint: 3 decámetros es lo
mismo que 3 dam.
(3 puntos
300 cm
30,000 cm
300.000 cm
3,000 cm

Answers

Answer:

[tex]3 \times 10000 = 30000[/tex]

deca

Decompose 2 ⅜ Plz help

Answers

Answer:

19 / 8

Step-by-step explanation:

2 3/8 = 19/8

which number makes the statement true
12:30 = x:50
A) 30
B) 32
C) 35
D) 41

Answers

Answer:

20

None of the answers shown are correct

Step-by-step explanation:

12 : 30 = x : 50

Handle as a proportion

12/30 = x/50

multiply both sides by 50

12/30 * 50 = x

20 = x

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