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Rainfall (in mm) over 30 days in a hill station is grouped as:
0-10: 8, 10-20: 10, 20-30: 6, 30-40: 4, 40-50: 2.
Find the mean daily rainfall using the assumed mean method (a = 25).

Class 10Mean of Grouped DataStatistics and Probability
  • A20
  • B18
  • C19
  • D38

Step-by-Step Solution

Class marks: 5,15,25,35,45. di = -20,-10,0,10,20. fi*di = 8*-20+10*-10+6*0+4*10+2*20 = -160-100+0+40+40 = -180. sum fi = 30. Mean .
Answer: C) 19

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