The mean of five numbers is . Four of the numbers are . What is the fifth number?
Answer and explanation
Correct answer: B. 21
- Step 1: Determine the total sum needed: .
- Step 2: Find the sum of the four given numbers: .
- Step 3: Subtract from the total to find the missing value: .
Answer
21.
Why not the others: - 22 is the mean of the numbers. - 16 adds rather than subtracts the constant term in the final step in . - 26 omits the factor of 2 in the denominator during simplification.
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