17. The average age of fifteen students in a primary
school is 12 years, the average age of 16 students is
15 years and that of 18 students is 14 years, find the
average age of all the students.
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Answer:11 years
Explanation:
Age of the 15th student = [15 * 15 - (14 * 5 + 16 * 9)] = (225-214) = 11 years.
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