« previous next »

Author Question: Multiple-choice questions on a test each have 5 possible answers, one of which is correct. Assume ... (Read 100 times)

K@

  • Hero Member
  • *****
  • Posts: 608
on: Jul 25, 2018
Multiple-choice questions on a test each have 5 possible answers, one of which is correct.
  Assume that you guess the answers to 5 such questions.
 
  a. Use the multiplication rule to find the probability that the first 2 guesses are wrong and
  the last 3 guesses are correct. That is, find P(WWCCC), where C denotes a correct answer
  and W denotes a wrong answer.
  b. Make a complete list of the different possible arrangements of 2 wrong answers and 3
  correct answers, then find the probability for each entry in the list.
  c. Based on the preceding results, what is the probability of getting exactly 3 correct
  answers when 5 guesses are made?

Question 2

A study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet
  Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours.
 
  If 40 mechanics
  are randomly selected, find the probability that their mean rebuild time is less than 8.9 hours.
  A) 0.9589 B) 0.4276 C) 0.9608 D) 0.9756


chem1s3

  • Sr. Member
  • ****
  • Posts: 320
Reply #1 on: Jul 25, 2018
Answer to Question 1

a. 0.00512
b. WWCCC
WCWCC
WCCWC
WCCCW
CWWCC
CWCWC
CWCCW
CCWWC
CCWCW
CCCWW
Each of the 10 arrangements has probability 0.00512
c. 0.0512

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

A study by Seehausen and van Alphen involving the effects of male coloration on female choice in Afr A study by Seehausen and van Alphen involving the effects of male coloration on female choice in Afr
Social History Questions Social History Questions
If the valve clearance (lash) is not correct, loosen the retaining nut and turn the valve adjusting ... If the valve clearance (lash) is not correct, loosen the retaining nut and turn the valve adjusting ...
Answers only 27-29. I need help please Im not sure with my answers Answers only 27-29. I need help please Im not sure with my answers
Physics questions 3 and 5 Physics questions 3 and 5
PLEASE I NEED SUPPORT WITH THIS QUESTIONS IS ON THE IMAGE PLEASE ANSWER PLEASE I NEED SUPPORT WITH THIS QUESTIONS IS ON THE IMAGE PLEASE ANSWER
Video: Negative Feedback Regulation of Blood Pressure

For a complete list of videos, visit our video library