alleryThe mean of 5 numbers is 6. Four of them are 4, 5, 7 and 8. The fifth is?
A7
B6
C5
D8
Answer & Solution
Correct answer: B. 6
1. Total of all five = 5 x 6 = 30.
2. The four known add to 4 + 5 + 7 + 8 = 24.
3. The fifth is 30 - 24 = 6.
_Source: Wikipedia, Average (CC BY-SA 4.0), Average_
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