The following are the number of birth per year per 1,000 population for 20 countries: 34, 24, 10, 15, 22, 15, 17, 22, 10, 17, 25, 32, 15, 20, 31, 18, 37, 12, 15, 18. The mean birth per year per 1,000 population is:A. 22.3B. 19.5C. 22.45D.
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