Question

Approximate the mean for following frequency table.

Data	Frequency
60 - 64	13
65 - 69	22
70 - 74	13
75 - 79	7
80 - 84	5
85 - 89	4
90 - 94	2
95 - 99	1
100 - 104	1

mean =

Report answer accurate to one decimal place.

Approximate the mean for following GFDT.

Data	Frequency
50 - 54	1
55 - 59	4
60 - 64	5
65 - 69	14
70 - 74	24
75 - 79	11
80 - 84	11
85 - 89	7
90 - 94	1

mean =

Report answer accurate to one decimal place.

Answer 1

Solution,

Data	Frequency (f)	mid-point (x)	f * x
60 - 64	13	62	806
65 - 69	22	67	1474
70 - 74	13	72	936
75 - 79	7	77	539
80 - 84	5	82	410
85 - 89	4	87	348
90 - 94	2	92	184
95 - 99	1	97	97
100 - 104	1	102	102
Total	68		4896

n = 68

mean = f * x / n = 4896 / 68 = 72

Data	Frequency (f)	mid-point (x)	f * x
50 - 54	1	52	52
55 - 59	4	57	228
60 - 64	5	62	310
65 - 69	14	67	938
70 - 74	24	72	1728
75 - 79	11	77	847
80 - 84	11	82	902
85 - 89	7	87	609
90 - 94	1	92	92
Total	78		5706

n = 78

mean = f * x / n = 5706 / 78 = 73.2