A data set has a mean of 29 and consists of 4 numbers. If 3 of the numbers are 21, 39, 22, what is the remaining number?
- A. 39
- B. 29
- C. 27
- D. 34 ✓
Correct answer
D. 34
Explanation
Sum of all 4 numbers = mean × count = 29 × 4 = 116. Sum of the known numbers = 82. Remaining number = 116 - 82 = 34.
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