Calculate the mean age using assumed mean method : $(A = 40)$
Age (in years) $30 - 34$ $35 - 39$ $40 - 44$ $45 - 49$
Number of men $(f)$ $6$ $8$ $18$ $8$

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Solution

f x $f_{i} x_{i}$
30-34 6 32 192
35-39 8 37 296
40-44 18 42 756
45-49 8 47 376
40 1620
mean = $\frac{1620}{40} = 40.5$

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Age (in years)	$30 - 34$	$35 - 39$	$40 - 44$	$45 - 49$
Number of men $(f)$	$6$	$8$	$18$	$8$

	f	x	$f_{i} x_{i}$
30-34	6	32	192
35-39	8	37	296
40-44	18	42	756
45-49	8	47	376
	40		1620

Calculate the mean age using assumed mean method : (A=40)Age (in years)30−3435−3940−4445−49Number of men (f)68188

f x fixi 30-346 32 19235-39 8 37 296 40-44 18 42 756 45-49 8 47 376 40 1620mean = 162040=40.5

Calculate the mean age using assumed mean method : $(A = 40)$
Age (in years) $30 - 34$ $35 - 39$ $40 - 44$ $45 - 49$
Number of men $(f)$ $6$ $8$ $18$ $8$

f x $f_{i} x_{i}$
30-34 6 32 192
35-39 8 37 296
40-44 18 42 756
45-49 8 47 376
40 1620
mean = $\frac{1620}{40} = 40.5$