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.)
| 46 | 51.7 | 41.6 | 38.4 | 41.9 | 45.5 | 42.4 | 39.7 | 42.1 |
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 standard deviation
d) Interpret the standard deviation in this context.