3. The following data represent the age of the mother at childbirth for 1980 and 2002. Number of Births Number ofBirths Age of Mother 1980 (thousands) 2002 (thousands) 10–14 1.1 0.7 15–19 53.0 43.0 20–24 115.1 103.6 25-29 112.9 113.6 30–34 61.9 91.5 35–39 19.8 41.4 40-44 3.9 8.3 45-49 0.2 0.5 Source. National Vital Statistics Reports, Vol. 52, No. 10 (a) Find the population mean and standard deviation of age for mothers in 1980. (b) Find the population mean and standard deviation of age for mothers in 2002. (c) Which year has the higher mean age? (d) Which year has more dispersion in age?

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