alculate the mean deviation from mean from the following data: Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 No. of Students 6 5 8 15 7 6 3
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CI xi fi fixi
0-10 5 6 30
10-20 15 5 75
20-30 25 8 200
30-40 35 15 525
40-50 45 7 315
50-60 55 6 330
60-70 65 3 195
Sum of fi = 50
Sum of fixi = 1670
Mean deviation = 1670/50
= 33.5
0-10 5 6 30
10-20 15 5 75
20-30 25 8 200
30-40 35 15 525
40-50 45 7 315
50-60 55 6 330
60-70 65 3 195
Sum of fi = 50
Sum of fixi = 1670
Mean deviation = 1670/50
= 33.5
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