A data set has a mean of 20 and consists of 5 numbers. If four of the numbers are 15; 18; 22; and 25; what is the fifth number?
- A. 20 ✓
- B. 18
- C. 22
- D. 25
Correct answer
A. 20
Explanation
Sum of all 5 numbers = mean × count = 20 × 5 = 100. Sum of the four given numbers = 15+18+22+25 = 80. The fifth number = 100 - 80 = 20.
Submitted by: MCQsHub Editorial
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