The following distribution shows the daily pocket money of children of a locality. The mean pocket allowance is Rs. 18. Find the missing frequency f.

Daily pocket money (in Rs.) No. of children
11-13 7
13-15 6
15-17 9
17-19 13
19-21 f
21-23 5
23-25 4

Asked by Topperlearning User | 6th Nov, 2017, 01:22: PM

Expert Answer:

Daily pocket money (in Rs.)
   xi
            fi
            fi xi
            11-13
  12
           7
        84
            13-15
  14
           6
        84
            15-17
  16
           9
                 144        
            17-19
  18
           13
         234
            19-21
  20
           f
         20f
            21-23
  22
           5
         110
            23-25
  24
           4
          96
 
 
44+f
 
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Answered by  | 6th Nov, 2017, 03:22: PM