following is the table relates to weight of 100 students . calculated arithmetic mean using shortcut method ? class 10 nios
weght
20-30
30_40
40_50
50_60
60_70
70_80
no of students
7
10
35
30
8
10
Answers
Answered by
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Class Students di( xi-A) fidi
20-30 7 -28 -196
30-40 10 -25 -250
40-50 35 0 0
50-60 30 -5 -600
60-70 8 -27 -216
70-80 10 -20 -200
mean = A + fidi / fi
= 35 + (-1462) / 100
= 35 - 14.62
the mean is 20.38
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