Solve this:

Q(a). The ogive of the distribution of marks of 45 students is given below. Find mean by using step deviation method.
                      
    (b) The daily expenditure of 100 families are as follows :
  Expenditure in (Rs)   140-160   160-180  180-200  200-220  220-240
      No. of families         5       25       f1       f2       f3
 
Daily mean expenditure per family is Rs. 188. Find f1 and f2.

    (c) Calculate mean, median and mode of the following distribution :
     No. of wickets     2    3     4       5       6      7
     No. of matches     2    5     7       6       8      3

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b
 https://www.meritnation.com/ask-answer/question/plz-help-find-the-missing-frequencies-f1-and-f2-in-the-fo/statistics/3503147
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