If a student’s speed is 60 km/h for half the distance and 40 km/h for the other half, the average speed is: MCQ with Answer and Explanation

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If a student’s speed is 60 km/h for half the distance and 40 km/h for the other half, the average speed is:

A. 48 km/h

B. 45 km/h

C. 52 km/h

D. 50 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Harmonic mean of 60 and 40 = 2/(1/60 + 1/40) = 48 km/h.

This question belongs to: Accountancy and Statistics Statistics

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The term 'pilot survey' is associated with:

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C. Pre-testing the questionnaire

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Correct Answer: Option C

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A pilot survey is a small-scale trial to test the questionnaire and survey procedures.

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Which of the following is NOT a demographic process?

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Correct Answer: Option C

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Question #3

For two attributes A and B, if (A)=80, (B)=70, N=100, and they are independent, then (AB) should be:

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Correct Answer: Option A

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