The mean of five numbers is . Four of the numbers are . What is the fifth number?
Answer and explanation
Correct answer: D. 23
- 22 is the mean of the numbers.
- 18 is one of the four given numbers in the set.
- 28 is one of the four given numbers in the set.
- 18 is one of the four given numbers in the set.
- 28 is one of the four given numbers in the set.
- 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
23.
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