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 119 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

Chelseyj.hasty

  • Member
  • Posts: 319
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

Did you know?

Medication errors are more common among seriously ill patients than with those with minor conditions.

Did you know?

Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Time Slows Down Near Matter Time Slows Down Near Matter
Sleep Requirements Change with Age Sleep Requirements Change with Age
Adjusting a valve takes both hands—one to hold the wrench to loosen and tighten the lock nut and ... Adjusting a valve takes both hands—one to hold the wrench to loosen and tighten the lock nut and ...
Geoengineering is not a solution to climate change Geoengineering is not a solution to climate change
Determine the enthalpy change of this reaction Determine the enthalpy change of this reaction
The frequency of aneuploidy changes dramatically over developmental time. Between 6 to 8 weeks and 2 The frequency of aneuploidy changes dramatically over developmental time. Between 6 to 8 weeks and 2
Video: Hormonal regulation of pregnancy - week 1

For a complete list of videos, visit our video library