Global Engineers hired the following number of engineers during the first six months of 2017. Assume the data represent a sample.(20 pts)

Month	Engineers Hired (x)
January	3
February	2
March	4
April	2
May	6
June	0

NOTE: Round all answers to the hundredths place (2 decimal places)

a. Compute the sample mean.

b. Compute the sample variance.

c. Compute the sample standard deviation.

d. Compute the z-score for the month of May.

e. If the above data were a population, the denominator used to find the population variance, would be (enter the numeric value):