Question: Refer to the frequency distribution in the given exercise and find the standard deviation by using the formula below, where x represents the class midpoint,
Standard deviation for frequency distribution
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Age (yr) of Best Actress When Oscar Was Won ..............Frequency
20-29 ........................................................................29
30-39 ........................................................................34
40-49 ........................................................................14
50-59 ........................................................................3
60-69 ........................................................................5
70-79 ........................................................................1
80-89 ........................................................................1
SE n(n 1)
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