The weighted arithmetic mean formula is: MCQ with Answer and Explanation

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The weighted arithmetic mean formula is:

A. Σx / Σw

B. Σwx / n

C. Σw / Σwx

D. Σwx / Σw

Answer: Option D

Solution (By JKSSB Mock Tests)

Weighted mean = Σ(w_i × x_i) / Σ w_i.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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In Bayes' theorem, the initial probabilities before observing evidence are called:

A. Posterior probabilities

B. Marginal probabilities

C. Likelihoods

D. Prior probabilities

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Correct Answer: Option D

Explanation:
Prior probabilities represent the initial degree of belief.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Data on attributes is said to be consistent if:

A. All class frequencies are positive integers

B. The sum of all frequencies equals the sample size

C. Attributes are independent of each other

D. No calculated class frequency is negative, as negative frequencies are impossible

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Correct Answer: Option D

Explanation:
Consistency requires that all derived class frequencies (including ultimate classes) are non-negative, as negative counts are logically impossible in real-world data.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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If P(A)=0.5, P(B)=0.3, and A, B are mutually exclusive, then P(A∪B) is:

A. 0.5

B. 0.2

C. 0.15

D. 0.8

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Correct Answer: Option D

Explanation:
0.5+0.3=0.8.

This question belongs to: Accountancy and Statistics Statistics

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