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Find the standard deviation,

`s`

, of sample data summarized in the frequency distribution table given below by using the formula below, where

`x`

represents the class midpoint,

`f`

represents the class frequency, 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 data values, 9.0 . \table[[Interval,

`20-29`

,

`30-39`

,

`40-49`

,

`50-59`

,

`60-69`

,21]] Standard deviation

`=`

`?`

(Round to one decimal place as needed.)