Cumulative frequency of number of books purchased----
January 150
February 260
March 290
April 360
May 450
June 580
July 780
August 1010
September 1120
In which month were highest number of books purchased ?

Solution

No. of books sold :

Jan = 150

Feb = 260-150 = 110

Mar = 290-260 = 30

Apr = 360-290 = 70

May = 450-360 = 90

Jun = 580-450 = 130

Jul = 780-580 = 200

Aug = 1010-780 = 230 [MAX]

Sep = 1120-1010 = 110

=> Maximum no. of books are sold in August.

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Cumulative frequency of number of books purchased----January 150February 260March 290April 360May 450June 580July 780August 1010September 1120In which month were highest number of books purchased ?