Question: Consider the following frequency distribution for a sample of 40 observations: Class Frequency 04 .............5 59 .............8 1014 ........... 11 1519 ...........9 2024 ...........7 a.

Consider the following frequency distribution for a sample of 40 observations:
Class Frequency
0–4 .............5
5–9 .............8
10–14 ........... 11
15–19 ...........9
20–24 ...........7
a. Calculate the sample mean.
b. Calculate the sample variance and sample standard deviation.

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