This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The time it takes a mechanic to change the oil in a car is exponentially distributed with a mean of ... (Read 131 times)

Melani1276

  • Hero Member
  • *****
  • Posts: 516
on: Jun 24, 2018
The time it takes a mechanic to change the oil in a car is exponentially distributed with a mean of 5 minutes.
 a. What is the probability density function for the time it takes to change the oil?
  b. What is the probability that it will take a mechanic less than 6 minutes to change the oil?
  c. What is the probability that it will take a mechanic between 3 and 5 minutes to change the oil?

Question 2

A coal company wants to determine a 95 confidence interval estimate for the average daily tonnage of coal that it mines. Assuming the company reports that the standard deviation of daily output is 200 tons, how many days should it sample so that the margin of error will be 39.2 tons or less?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Hikerman221

  • Sr. Member
  • ****
  • Posts: 346
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. f(x) = (1/5) e-x/5 for x  0
b. .6988
c. .1809

Answer to Question 2

100


Melani1276

  • Member
  • Posts: 516
Reply 2 on: Jun 24, 2018
Thanks for the timely response, appreciate it

31809pancho

  • Member
  • Posts: 317
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

Everyone has one nostril that is larger than the other.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Time Time
For a time Dr. Seuss—Theodor Seuss Geisel—drew political cartoons. This one, published in ... For a time Dr. Seuss—Theodor Seuss Geisel—drew political cartoons. This one, published in ...
Older adulthood can be a time of independence and exploration as responsibilities diminish and the ... Older adulthood can be a time of independence and exploration as responsibilities diminish and the ...
Marx's Model of Historical Change Marx's Model of Historical Change
Using a vacuum hose and a test light to ground one cylinder at a time on a distributorless ignition ... Using a vacuum hose and a test light to ground one cylinder at a time on a distributorless ignition ...
Mirror recognition and self-naming develop at almost exactly the same time Mirror recognition and self-naming develop at almost exactly the same time
Video: Dendrite Animation

For a complete list of videos, visit our video library