NABTEB Mathematics 2025 Objective — Question 56

Question 56 of 60 from the National Business and Technical Examinations Board (NABTEB) Mathematics 2025 Objective paper, with the correct answer and a full explanation.

Find the standard deviation of the following set of numbers: 9, 8, 7, 6, 4, 2.

A. 2.38Correct
B. 4.38
C. 5.67

Explanation

Mean = 36/6 = 6. Variance = ((9-6)^2+(8-6)^2+(7-6)^2+(6-6)^2+(4-6)^2+(2-6)^2)/6 = 34/6 ~= 5.667. Standard deviation = sqrt(5.667) ~= 2.38.

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