Question: 28 Find the standarddeviation, s, of sample data summarized in the frequency distribution table given below by using the formulabelow, where x represents the classmidpoint,

Find the standarddeviation, s, of sample data summarized in the frequency distribution table given below by using the formulabelow, where x represents the classmidpoint, f represents the classfrequency, and n represents the total number of sample values.Also, compare the computed standard deviation to the standard deviation obtained from the original list of datavalues, 9.0.

Interval

20-29

30-39

40-49

50-59

60-69

70-79

Frequency

Standard deviation=

(Round to one decimal place asneeded.)

Consider a difference of20% between two values of a standard deviation to be significant. How does this computed value compare with the given standarddeviation, 9.0?

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