Frequency polygon: The following frequency distribution presents the batting averages of professional baseball players who had 300 or more plate appearances during a recent season. Batting Average Frequency 01800199 2 02000219 14 02200239 36 02400259 56 02600279 57 02800299 53 0300-0319 30 0320-0339 14 0340-0359 4 (a) Find the midpoints for the classes. Round the answers to three decimal places. Class Midpoint Frequency 0180-0199 7 2 02000219 : 14 02200239 : 36 02400259 : 56 02600279 : 57 02800299 : 53 03000319 : 30 03200339 7 14 03400359 7 4 ' X 6)