The following table gives the frequency distribution of prices for all 30 cellphone cases sold in the college bookstor Price 20 to less than 4 30 30 to less than 7 40 40 to less than 10 50 50 to less than 6 60 60 to less than 3 70 The variance of the textbook prices, rounded to two decimal places, is: o X 8.C Mostly