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The marks 2, 4, 4, 4, 5, 5, 7, 9 form a whole population. Its standard deviation is
A1
B3
C2
D4
Answer & Solution
Correct answer: C. 2
The mean is 5 and the squared deviations total 32, so the variance is 32/8 = 4 and the standard deviation is 2.
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