Arithmetic Mean of a Data Set
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What is the arithmetic mean of 4, 7, 9, and 10?
- A7.0
- B7.5
- C8.0
- D8.5
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Answer: B. 7.5
The mean is the sum divided by the number of observations: x̄ = (4 + 7 + 9 + 10)/4 = 30/4 = 7.5.
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