The following data represent the age of the mother at childbirth for 1980 and 2013.

(a) Approximate the population mean and standard deviation of age for mothers in 1980.
(b) Approximate the population mean and standard deviation of age for mothers in 2013.
(c) Which year has the higher mean age?
(d) Which year has more dispersion in age?

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Age 1980 Births (thousands) 2013 Births (thousands) 10-14 9.8 3.1 15-19 551.9 274.6 20-24 1226.4 902.1 25-29 1108.2 1127.6 30-34 549.9 1044.0 35-39 140.7 487.5 40-44 23.2 110.3 45-49 1.1 8.2