1 statistics question

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. [E(F.x ) ] - [E(.x) ] S= n(n - 1) Interval 30-36 37-43 44-50 51-57 58-64 65-71 Frequency 5 20 40 17 9 2 Standard deviation = 7.6 (Round to one decimal place as needed.) Consider a difference of 20% between two values of a standard deviation to be significant. How does this computed value compare with the given standard deviation, 9.0? O A. The computed value is significantly greater than the given value. O B. The computed value is significantly less than the given value. O C. The computed value is not significantly different from the given value