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. 50 km/h

C. 52 km/h

D. 45 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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Question #1

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Which of the following index numbers satisfies the Circular Test?

A. Paasche's Index

B. Laspeyres' Index

C. Fisher's Ideal Index

D. Kelly's Fixed Weight Index

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Correct Answer: Option D

Explanation:
Fisher's index fails the Circular Test. Only indexes with constant weights, like Kelly's or simple geometric mean of price relatives, pass it.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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A 'questionnaire' is said to be reliable if it:

A. Has many open-ended questions

B. Measures what it intends to measure

C. Is long and detailed

D. Yields consistent results on repeated administration

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Correct Answer: Option D

Explanation:
Reliability refers to consistency of measurement.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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A researcher wants to ensure every individual in a population has an equal chance of being selected. She should use:

A. Simple random sampling

B. Quota sampling

C. Snowball sampling

D. Purposive sampling

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Correct Answer: Option A

Explanation:
Simple random sampling gives each member an equal probability of selection.

This question belongs to: Accountancy and Statistics Statistics

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