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The eight marks 2, 4, 4, 4, 5, 5, 7, 9 have mean 5. What is their population standard deviation?
A2
B4
C3
D5
Answer & Solution
Correct answer: A. 2
Squared deviations sum to 32, so the variance is 32/8 = 4 and the standard deviation is 2.
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