CA Foundation P3 · Chapter 14 · Question 7 of 10
The standard deviation of the observations 2, 4, 6, 8, 10, taking them as the whole population (divisor n), is (to two decimals):
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) 2.83
Explanation
Mean = 30/5 = 6. Squared deviations: 16, 4, 0, 4, 16, total 40. Variance = 40/5 = 8 and SD = √8 = 2.83. 8 is the variance, 3.16 uses divisor n − 1 (√10), and 2.40 is the mean deviation about the mean.
More Measures of Central Tendency and Dispersion MCQs
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