Find the mean for the following frequency tables. (Round your answers to one decimal place.) (a) Grade Frequency 49.5-59.5 2 59.5-69.5 3 69.5-79.5 7 79.5-89.5 11 89.5-99.5 5 (b ) Daily Low Temperature Frequency 49.5-59.5 52 59.5-69.5 35 69.5-79.5 15 79.5-89.5 1 89.5-99.5 0 X (c) Points per Game Frequency 49.5-59.5 14 59.5-69.5 32 69.5-79.5 15 79.5-89.5 22 89.5-99.5 2 X