From the following frequency distribution calculate the first four moments, b1, and b2.

Question: From the following frequency distribution calculate the first four moments, β₁, and β₂.

Class	f
10-14	1
15-19	4
20-24	8
25-29	19
30-34	35
35-39	20
40-44	7
45-49	1
50-54	5

Solution: Let the assumed mean A=32

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