height in inches 8-11,12-15,16-19,20-23,24-27 frequency 18,23,38,47,32 identify the class width,  midpoint of the first class,  class boundaries of the first class, relative frequency for each class

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class width is the difference between the highest and lowest number in each class so 11-8 = 3 midpoint of the first class is (8+11)/2 = 9.5 class boundaries- add and subtract .5 to get 7.5 and 11.5 relative frequencies- add each frequency to the previous you get 18, 18+23 = 41, 41+38 = 79, 79+47=126, 126+32=158