The mass of a whiffle ball varies, usually between 40 and 50 grams. You decide to gather a random sample of whiffle balls and record the mass of each. Your data is displayed in the table below. (Units are grams.)


44.839.34543.444.546.344.938.742.139.446.8
     Checksum: 475.2


You would like to describe the variability in whiffle ball mass from your sample. You decide to make several calculations describing the "spread" of the data set.
Find the following:

a) range


b) IQR


c) sample variance


d) sample standard deviation


e) Interpret the standard deviation in this context.