The weighted harmonic mean is used to average: MCQ with Answer and Explanation

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The weighted harmonic mean is used to average:

A. Performance ratios when weights are proportional to denominator

B. Growth rates

C. Speeds when distances vary

D. Prices when expenditures are equal

Answer: Option A

Solution (By JKSSB Mock Tests)

Weighted harmonic mean is appropriate when the weights correspond to the denominator of the ratio.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If the probability of a student passing an exam is 0.8 and the probability of another student passing is 0.7, and these events are independent, the probability that at least one passes is:

A. 1.5

B. 0.94

C. 0.56

D. 0.5

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Correct Answer: Option B

Explanation:
P(at least one) = 1 - P(both fail) = 1 - (0.2×0.3) = 1 - 0.06 = 0.94.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Infant mortality rate (IMR) is expressed as:

A. Infant deaths per 1000 children

B. Infant deaths per 1000 women

C. Infant deaths per 1000 mid-year population

D. Infant deaths per 1000 live births

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Correct Answer: Option D

Explanation:
IMR = (deaths < 1 year / live births) × 1000.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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A researcher is interested in the effect of a new drug. She selects 50 patients randomly from a hospital list. The list is the:

A. Sample unit

B. Sampling frame

C. Sample

D. Population

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Correct Answer: Option B

Explanation:
The hospital list is the sampling frame from which the sample is drawn.

This question belongs to: Accountancy and Statistics Statistics

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