A population has a mean of 84 and a standard deviation of 12 . A ...

[HCHenry]

A population has a mean of 84 and a standard deviation of 12 . A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is _____.
 a. .0347
  b. .7200
  c. .9511
  d. None of the answers is correct.

Question 2

During lunchtime, customers arrive at Bob's Drugs according to a Poisson distribution with  = 4 per minute. During a one-minute interval, determine the following probabilities:
 a. no arrivals; b. 1 arrival; c. 2 arrivals; and, d. 3 or more arrivals.
  e. What is the probability of 2 arrivals in a two-minute period?

[kusterl]

Answer to Question 1

c

Answer to Question 2

a. .0183
b. .0733
c. .1465
d. .7619
e. .0107

[HCHenry]

Thanks for the timely response, appreciate it

[ashely1112]

Excellent