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The monthly expenditure (in thousands of Rs) of 50 families is grouped into classes 1-3, 3-5, 5-7, 7-9, 9-11 with frequencies 8, 15, 14, 9, 4.
Find the mean monthly expenditure (in thousands of Rs) using the direct method.

Class 10Mean of Grouped DataStatistics and Probability
  • A4.44
  • B6.44
  • C5.44
  • D10.88

Step-by-Step Solution

Class marks: 2,4,6,8,10. fi*xi = 8*2+15*4+14*6+9*8+4*10 = 16+60+84+72+40 = 272. sum fi = 50. Mean = .
Answer: C) 5.44

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