The mean of five numbers is . Four of the numbers are . What is the fifth number?
Answer and explanation
Correct answer: A. 32
- Step 1: For a mean of , the five values must total .
- Step 2: Add the four known values: .
- Step 3: Find the fifth number by taking the difference: .
Answer
32.
Why not the others: - 27 adds rather than subtracts the constant term in the final step in . - 26 is the mean of the numbers. - 37 omits the factor of 2 in the denominator during simplification.
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