calculate the arithmetic mean for the following distribution by using step-deviation method age [in years] 10-20 20-30 30-40 40-50 50-60 no pf persons 11 12 12 12 15
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Class 10- 20 2-30 30-40 40-50 50-60
Freque11 12 12 12 15
Mid VAue
X15 25 35 45 55
D= x-35/10
-2 -1 0 1 2
FD -22 -12 0 12 30
SUM = 8
Mean = A + sumD / sum F Xi
35 + 8/ 62 x 10
= 35 + 80/62
= 35+ 1.3= 36.3
Freque11 12 12 12 15
Mid VAue
X15 25 35 45 55
D= x-35/10
-2 -1 0 1 2
FD -22 -12 0 12 30
SUM = 8
Mean = A + sumD / sum F Xi
35 + 8/ 62 x 10
= 35 + 80/62
= 35+ 1.3= 36.3
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