For two attributes, if (AB)=20, (Aβ)=30, (αB)=10, (αβ)=40, then N is: MCQ with Answer and Explanation

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For two attributes, if (AB)=20, (Aβ)=30, (αB)=10, (αβ)=40, then N is:

A. 90

B. 80

C. 110

D. 100

Answer: Option D

Solution (By JKSSB Mock Tests)

N = 20+30+10+40 = 100.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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A life table is primarily based on which of the following demographic measures?

A. Infant Mortality Rate

B. Age Specific Death Rate

C. Age Specific Fertility Rate

D. General Fertility Rate

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Correct Answer: Option B

Explanation:
Life tables are constructed using Age Specific Death Rates (qx) to determine the probability of surviving from one age to the next.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Given N=100, (A)=40, (B)=30. The expected frequency of (AB) under independence is:

A. 40

B. 30

C. 12

D. 20

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Correct Answer: Option C

Explanation:
Expected (AB) = (A)×(B)/N = 40×30/100 = 12.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The sample space for tossing two fair coins is:

A. {HH, HT, TH, TT}

B. {0, 1, 2}

C. {2H, 1H1T, 2T}

D. {H, T}

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Correct Answer: Option A

Explanation:
The sample space lists all possible distinct outcomes; for two coin tosses, the outcomes are HH, HT, TH, and TT, representing the sequence of heads (H) and tails (T).

This question belongs to: Accountancy and Statistics Statistics

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