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What is the population variance of the first five natural numbers 1, 2, 3, 4, 5?
A2.5
B2
C3
D1
Answer & Solution
Correct answer: B. 2
The mean is 3 and squared deviations 4, 1, 0, 1, 4 sum to 10, so the variance is 10/5 = 2.
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