The cumulative frequency of the class 70-90 is :
80
120
180
40
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From the graph, we form the cumulative frequency table :
Hence, Option 2 is the correct option.
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From the given table the values of a, b and c are :
a = 16, b = 52 and c = 8
a = 16, b = 12 and c = 8
a = 40, b = 52 and c = 60
a = 40, b = 12 and c = 60
