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The runs scored by 40 batsmen in a local Ranji match are grouped as:
0-20: 5, 20-40: 12, 40-60: 13, 60-80: 7, 80-100: 3.
Find the mean runs scored using the step-deviation method (a = 50, h = 20).

Class 10Mean of Grouped DataStatistics and Probability
  • A45.5
  • B50.5
  • C40.5
  • D91

Step-by-Step Solution

Class marks: 10,30,50,70,90. ui = -2,-1,0,1,2. fi*ui = 5*-2+12*-1+13*0+7*1+3*2 = -10-12+0+7+6 = -9. sum fi = 40. Mean .
Answer: A) 45.5

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