MathematicsStatisticsJAMB
The mean of five numbers is 8. Four of them are 6, 7, 9 and 10. Find the fifth number.
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Answer: D. 8
The total is 5 × 8 = 40; 40 − (6 + 7 + 9 + 10) = 40 − 32 = 8.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.