In attributes, if (A)=70, (B)=50, (αβ)=10, and N=100, then (AB) is: MCQ with Answer and Explanation

In attributes, if (A)=70, (B)=50, (αβ)=10, and N=100, then (AB) is:
A. 40
B. 30
C. 10
D. 20
Answer: Option B
Solution (By JKSSB Mock Tests)
(αβ)= N - (A) - (B) + (AB) ⇒ 10 = 100 -70 -50 + (AB) ⇒ (AB)=30.

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Practice More Statistics Questions

Question #1
The primary use of vital statistics is to:
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B. Assess environmental quality
C. Calculate national income
D. Determine electoral constituencies

Correct Answer: Option A


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Vital statistics provide critical inputs for public health planning, evaluating healthcare interventions, forecasting population trends, and formulating social policies related to fertility, mortality, and family welfare.

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Question #2
In a frequency distribution with exclusive class intervals 0-10, 10-20, 20-30, a value exactly equal to 20 should be included in:
A. 10-20
B. 20-30
C. Either 10-20 or 20-30
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Correct Answer: Option B


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In exclusive classification, the upper limit is excluded; thus 20 belongs to the class 20-30.

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If a dataset has values ranging from 10 to 95 and you decide to use a class width of 10, how many classes would be needed for an exclusive frequency distribution?
A. 11
B. 10
C. 9
D. 8

Correct Answer: Option C


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Range = 95 - 10 = 85. Number of classes = Range / Class width = 85 / 10 = 8.5, rounded up to 9 classes to cover the entire data range without gaps.

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