What is the arithmetic mean of the five decimal scores: 4.5, 6.2, 7.8, 5.5, and 8.0?
Answer and explanation
Correct answer: B. 6.4
- Step 1: Sum = 4.5 + 6.2 + 7.8 + 5.5 + 8.0 = 32.0. Step 2. Mean = 32.0 / 5 = 6.4. Answer: 6.4, summing all values to 32.0 and dividing by 5. Why not the others: 6.2 is the median (middle value when sorted: 4.5, 5.5, 6.2, 7.8, 8.0), not the mean.
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