The ages of three contestants in the Cayley Contest are 15 years, 9 months; 16 years, 1 month; and 15 years, 8 months. Their average (mean) age is
(A) 15 years, 8 months (B) 15 years, 9 months (C) 15 years, 10 months (D) 15 years, 11 months (E) 16 years
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Source: CEMC, University of Waterloo,
licensed CC-BY-NC-4.0.
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