Find the standard deviation, s, of sample data summarized in the frequency distribution table 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, 11.1. equals startroot startfraction n left bracket summation from nothing to nothing left parenthesis f times x squared right parenthesis right bracket minus left bracket summation from nothing to nothing left parenthesis f times x right parenthesis right bracket squared over n left parenthesis n minus 1 right parenthesis endfraction endroot interval 20-26 27-33 34-40 41-47 48-54 55-61 62-68 frequency 2 2 6 4 11 39 30