CIMA BA1 · Chapter 9 · Question 4 of 11
Treating the values 2, 4, 6, 8 and 10 as a complete population, what is their standard deviation (to two decimal places)?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: D) 2.83
Explanation
Mean = 30 / 5 = 6. Squared deviations: 16, 4, 0, 4, 16, totalling 40. Variance = 40 / 5 = 8. Standard deviation = square root of 8 = 2.83. Dividing by n - 1 instead would give 3.16.
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