Global Engineers Hired the Following Number of Class 1 Engineers

Global Engineers hired the following number of Class 1 engineers during the first six months of the past year. (Assume the data represent a sample.)
No. of Class 1
Month Engineers Hired
January 3
February 2
March 4
April 2
May 6
June 0
a.Determine the mean, the median, the mode, and the range for the above data.
b.Compute the variance and the standard deviation.
c.Compute the first and the third quartiles.
d.Compute the z-scores for the months of May and June.