Question: This frequency distribution represents the data obtained from a sample of word processor repairers. The values are the days between service calls on 80 machines.

This frequency represents the data obtained from a sample of word processor repairers. The values are the days between service calls on 80 machines.
Class boundaries Frequency
25.5–28.5 .........5
28.5–31.5 .........9
31.5–34.5 .........32
34.5–37.5 .........20
37.5–40.5 .........12
40.5–43.5 ...........2
Find the variance and standard deviation.

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