Population density is expressed as: MCQ with Answer and Explanation

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Population density is expressed as:

A. Number of births per 1000 population

B. Number of persons per square km

C. Number of males per 1000 females

D. Number of houses per square km

Answer: Option B

Solution (By JKSSB Mock Tests)

Population density = Total population / Land area.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If each of 20 values is increased by 10, the arithmetic mean will:

A. Increase by 10

B. Increase by 20

C. Increase by 200

D. Remain unchanged

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Correct Answer: Option A

Explanation:
Adding a constant to all observations increases the mean by the same constant.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Two events A and B are said to be mutually exclusive if:

A. P(A|B) = P(A)

B. P(A ∪ B) = 1

C. P(A ∩ B) = P(A) × P(B)

D. P(A ∩ B) = 0

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Correct Answer: Option D

Explanation:
Mutually exclusive events cannot occur simultaneously, meaning their intersection is the empty set (probability is zero).

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The data collected by the NSSO through its surveys is an example of:

A. None

B. Primary data for NSSO

C. Secondary data for researchers

D. Both A and B

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Correct Answer: Option D

Explanation:
For NSSO, it is primary data; for others using the reports, it is secondary data.

This question belongs to: Accountancy and Statistics Statistics

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