Age-specific fertility rates (ASFRs) FSM: 1973, 1980, 1994 and 2000
Age group of women	1973	1980	1994	2000
15-19	0.090	0.07	0.05	0.04
20-24	0.33	0.27	0.18	0.19
25-29	0.43	0.34	0.22	0.23
30-34	0.38	0.31	0.2	0.2
35-39	0.27	0.27	0.15	0.14
40-44	0.13	0.16	0.09	0.07
45-49	0.02	0.08	0.03	0.02
Total fertility rate	8.29	7.39	4.65	4.44
What is the average age of childbirth in 1973?
Middle of age bin	Frequency Year 1973	Relative Freq	x*p(x)
17	0.09	0.05	0.92
22	0.33	0.2	4.42
27	0.43	0.26	6.94
32	0.38	0.23	7.39
37	0.27	0.16	6
42	0.13	0.08	3.39
47	0.02	0.01	0.65
Sums:	1.66	1	29.72
What is the average age of childbirth in 2000?
Middle of age bin	Frequency Year 2000	Relative Freq	x*p(x)
17	0.04	0.05	0.84
22	0.19	0.22	4.73
27	0.23	0.25	6.84
32	0.2	0.23	7.28
37	0.14	0.16	5.79
42	0.07	0.08	3.26
47	0.02	0.02	0.95
Sums:	0.89	1	29.70
Source:
http://www.spc.int/prism/country/fm/stats/Key_stats.xls
HW option: mean age of child birth 1980, 1984.