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The daily pocket money (in Rs) of 25 children in a Mumbai colony is grouped as:
11-13: 3, 13-15: 6, 15-17: 9, 17-19: 5, 19-21: 2.
Using the step-deviation method with a = 16 and h = 2, find the mean pocket money (in Rs).

Class 10Mean of Grouped DataStatistics and Probability
  • A15.76
  • B16.76
  • C31.52
  • D14.76

Step-by-Step Solution

Class marks: 12,14,16,18,20. ui=(xi-16)/2 = -2,-1,0,1,2. fi*ui = 3*-2+6*-1+9*0+5*1+2*2 = -6-6+0+5+4 = -3. sum fi = 25. Mean .
Answer: A) 15.76

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