The harmonic mean of the numbers 3, 6, 9 is: MCQ with Answer and Explanation

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The harmonic mean of the numbers 3, 6, 9 is:

A. 54/11

B. 18/11

C. 6

D. 11/54

Answer: Option A

Solution (By JKSSB Mock Tests)

HM = 3 / (1/3 + 1/6 + 1/9) = 3 / ( (6+3+2)/18 ) = 3 / (11/18) = 54/11 ≈ 4.909.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Which of the following is a quantitative classification?

A. Gender

B. Height in centimeters

C. Religion

D. Nationality

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Correct Answer: Option B

Explanation:
Height is a measurable quantity, hence quantitative classification.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If P(A) = 0.3, P(B) = 0.4, and A, B are mutually exclusive, then P(A∪B) is:

A. 0.1

B. 0.12

C. 0.7

D. 0.5

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Correct Answer: Option C

Explanation:
Mutually exclusive → P(A∪B) = P(A) + P(B) = 0.3+0.4=0.7.

This question belongs to: Accountancy and Statistics Statistics

Question #3

If class intervals are inclusive, before plotting a histogram we must:

A. Convert them to exclusive by adjusting boundaries

B. Change class width

C. Use cumulative frequencies

D. Plot directly

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Correct Answer: Option A

Explanation:
Inclusive intervals have gaps; adjusting by half of the gap makes them continuous.

This question belongs to: Accountancy and Statistics Statistics

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