The formula for the standard deviation of a sample is: s equals square root of fraction numerator 1 over denominator n minus 1 end fraction sum from i equals 1 to n of left parenthesis X subscript i minus X with bar on top right parenthesis squared end root Select the true statement for the following data set that has a mean of 9: 3, 7, 8, 8, 8, 9, 10, 10, 13, 14 Answer choices are rounded to the hundredths place. The variance is 8.50 and the standard deviation is 3.09. The variance is 9.56 and the standard deviation is 3.09. The variance is 9.56 and the standard deviation is 8.50. The variance is 3.09 and the standard deviation is 9.56