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Author Question: A population has a mean of 53 and a standard deviation of 21 . A sample of 49 observations will be ... (Read 210 times)

waynest

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on: Jun 24, 2018
A population has a mean of 53 and a standard deviation of 21 . A sample of 49 observations will be taken. The probability that the sample mean will be greater than 57.95 is _____.
 a. 0
  b. .0495
  c. .4505
  d. None of the answers is correct.

Question 2

Telephone calls arrive at the Global Airline reservation office in Louisville according to a Poisson distribution with a mean of 1.2 calls per minute.
 a. What is the probability of receiving exactly 1 call during a one-minute interval?
  b. What is the probability of receiving at most 2 calls during a one-minute interval?
  c. What is the probability of receiving at least 2 calls during a one-minute interval?
  d. What is the probability of receiving exactly 4 calls during a five-minute interval?
  e. What is the probability that at most 2 minutes elapse between 1 call and the next?


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scrocafella

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Reply #1 on: Jun 24, 2018
Answer to Question 1

b

Answer to Question 2

a. .36
b. .88
c. .34
d. .135
e. .9093


waynest

  • Member
  • Posts: 553
Reply 2 on: Jun 24, 2018
Great answer, keep it coming :)

brbarasa

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Reply 3 on: Yesterday
Excellent

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