calculate the mean deviation and standard deviation are follows ( class 11.
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Step-by-step explanation:
Total number of person = 500
For grouped frequency consider an average or the midpoint of ages.
i:e
AGE Number of person
(a) (N) (a.n)
25 3 75
35 51 1785
45 122 5490
55 141 7755
65 130 8450
75 51 3825
85 2 170
∑a.n = 27550
Mean = ∑(a.n)/∑n
= 27550/500
= 55.1
Use this to calculate S.D similarly.
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