A grouped frequency distribution table with classes of equal sizes using 63 - 72 ( 72 included ) as one of the class is constructed for the following data : 30 , 32 , 45 , 54 , 74 , 78 , 108 ,112 , 66 , 76 , 88 , 40 , 14 , 20 , 15 , 35 , 44 , 66 , 75 , 84 , 95 , 96 , 102 , 110 , 88 , 74 , 112 , 14 , 34 , 44.
The number of classes in the distribution will be : ( a ) 9 ( b ) 10 ( c ) 11 ( d ) 12
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