If the mean of a set of observations is 0, it implies: MCQ with Answer and Explanation

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If the mean of a set of observations is 0, it implies:

A. The observations are all positive

B. There are no negative observations

C. All values are zero

D. The sum of all values is zero

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean = Σx / n. If mean = 0, then Σx = 0.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

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Which method of collecting primary data is most suitable when the field of investigation is highly confidential and restricted?

A. Direct personal interview

B. Information through local correspondents

C. Indirect oral investigation

D. Mailed questionnaire method

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Correct Answer: Option A

Explanation:
Direct personal interview ensures maximum confidentiality as the investigator directly collects data without intermediaries.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If P(A)=0.4, P(B)=0.5, and A and B are independent, then P(A' ∩ B') equals:

A. 0.2

B. 0.3

C. 0.9

D. 0.1

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Correct Answer: Option B

Explanation:
P(A')=0.6, P(B')=0.5, independence ⇒ P(A'∩B') = 0.6 × 0.5 = 0.3.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Life tables are primarily used to compute:

A. Migration rates

B. Life expectancy

C. Fertility rates

D. Population density

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Correct Answer: Option B

Explanation:
Life tables synthesize mortality rates to derive life expectancy and survival probabilities.

This question belongs to: Accountancy and Statistics Statistics

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