Calculate the mean for the data listed below in the grouped frequency distribution
group X mid X f
96-100 2
91-95 4
86-90 7
81-85 9
76-80 10
71-75 12
66-70 11
61-65 12
56-60 7
51-55 6
46-50 4
41-45 3
= 70.53
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