1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
expeople1 [14]
3 years ago
9

An HP laser printer is advertised to print text documents at a speed of 18 ppm (pages per minute). The manufacturer tells you th

at the printing speed is actually a Normal random variable with a mean of 17.42 ppm and a standard deviation of 3.25 ppm. Suppose that you draw a random sample of 12 printers. Part i) Using the information about the distribution of the printing speeds given by the manufacturer, find the probability that the mean printing speed of the sample is greater than 18.12 ppm. (Please carry answers to at least six decimal places in intermediate steps. Give your final answer to the nearest three decimal places).
Mathematics
1 answer:
aliya0001 [1]3 years ago
4 0

Answer:

0.227 = 22.7% probability that the mean printing speed of the sample is greater than 18.12 ppm.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 17.42 ppm and a standard deviation of 3.25 ppm.

This means that \mu = 17.42, \sigma = 3.25

Sample of 12:

This means that n = 12, s = \frac{3.25}{\sqrt{12}}

Find the probability that the mean printing speed of the sample is greater than 18.12 ppm.

This is 1 subtracted by the p-value of Z when X = 18.12.

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{18.12 - 17.42}{\frac{3.25}{\sqrt{12}}}

Z = 0.75

Z = 0.75 has a pvalue of 0.773.

1 - 0.773 = 0.227

0.227 = 22.7% probability that the mean printing speed of the sample is greater than 18.12 ppm.

You might be interested in
Write the equation of the line that has a slope of -5 and goes through (1,-4)
saveliy_v [14]

Answer:

y=-5x+1

Step-by-step explanation:

plug the coordinate points to the equation, and find your y intercept

7 0
3 years ago
How much would $200 invested at 4% interest compounded continuously be worth after 8 years? round your answer to the nearest cen
Arlecino [84]

Answer:

424--------------------------------------------------------

                                                                                 

7 0
3 years ago
What is the value of x in the equation below?
Alexeev081 [22]
X equals 4

I just did it
8 0
2 years ago
One vertex of a polygon is located at (3, –2). After a rotation, the vertex is located at (2, 3).
motikmotik

yes it is right when the vertex of the first polygon is located on 3 - 2 after rotation the work vertex will be there on (2 , 3) it is right

4 0
3 years ago
Read 2 more answers
If p-4(p-2(3-p))=12 solve for p
stira [4]
P-4(p-2(3-p))=12 remove the parentheses

P-4(p-6+2p)=12 collect like terms

P-4(3p-6)=12 remove the parentheses

P-12p+24=12 collect like terms

-11p+24=12 move the constant to the right

-11p=12-24 calculate

-11p=-12 divide both sides

P=12/11


Alternative form

P=1 1/11
8 0
2 years ago
Other questions:
  • HELP PLEASE! Can you please explain so I can understand how it was completed?
    7·1 answer
  • Please help with this question!!!!
    6·1 answer
  • )
    14·2 answers
  • Using a function on her calculator, Jamie can generate a single random digit by pressing the "Enter" key. She wants to experimen
    5·1 answer
  • What is the next term in this geometric sequence?<br> 104, -52, 26, -13, ...
    15·1 answer
  • The huh y b v c h b f y n<br>​
    14·2 answers
  • What is the center and radius of a circle with an equation (x+5)2 +(y-1)2 = 64​
    14·1 answer
  • Someone help and plz make sure it’s right
    15·1 answer
  • Mrs. Baxter deposits $2,000 in an account that earns 5% sample
    6·1 answer
  • A photographer is arranging 5 family members in a line for a picture.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!