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Find the mean of the following data by a suitable method. Number of wickets - 20-60 60-100 100-150 150-250 250-350 350-450 Number of bowlers - 7 5 16 12 2 3
No. of
wickets taken		 No. of bowlers xi di = -xi - 200 fidi
20 - 60 7 40 -160 -1120
60 - 100 5 80 -120 -600
100 - 150 16 125 -75 -1200
150 - 250 12 200 0 0
250 - 350 2 300 100 200
350 - 450 3 400 200 600
         
Total ? fi = 45     ? fidi = -2120

 

  Now
x = a +
? fidi
= 200 +
(-2120)
? fi
45

= 200 – 47.11 = 152.89

 


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