The monthly number of hours students spend doing community service are summarized in the computer output:

(a) Locate a measure of variation and also calculate the sample variance.
(b) Calculate the interquartile range and interpret this value.
(c) Give a value for the standard deviation that would correspond to greater variation in the hours of community service.

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Variable N Mean StDev CmtySer 19 4.32 4.58 Minimum Q1 0.00 1.00 Median 4.00 Q3 5.00 Maximum 20.00