Five numbers have a mean of 9. When one of them, 17, is removed, what is the mean of the remaining four?
Answer and explanation
Correct answer: A. 7
- Step 1: The sum is 5 x 9 = 45.
- Step 2: Without 17 the sum is 28, and the mean of four numbers is 28 / 4 = 7.
Answer
7.
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