The formula for the standard deviation of a sample is S X X n 1 1 Select the true statement for the following data set that has a mean of 8 4 6 6 6 9 9 12 12 Answer choices are rounded to the hundredths place O The variance is 2 98 and the standard deviation is 8 86 O The variance is 7 50 and the standard deviation is 2 98 O The variance is 8 86 and the standard deviation is 2 98 The variance is 8 86 and the standard deviation is 7 50