MathematicsStatisticsWAEC
The mean of five numbers is 12. Four of the numbers are 10, 14, 9 and 15. Find the fifth number.
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Answer: A. 12
Total = 5 × 12 = 60; 60 − (10 + 14 + 9 + 15) = 60 − 48 = 12.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.