The arithmetic mean of the first five natural numbers is: MCQ with Answer and Explanation

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The arithmetic mean of the first five natural numbers is:

A. 5

B. 4

C. 2.5

D. 3

Answer: Option D

Solution (By JKSSB Mock Tests)

(1+2+3+4+5)/5 = 15/5 = 3.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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A researcher wants to compare mortality between two towns with different age structures. She should use:

A. Neonatal mortality rate

B. Infant mortality rate

C. Standardized death rate

D. Crude death rate

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Correct Answer: Option C

Explanation:
Standardization removes the confounding effect of age.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The geometric mean of 4, 9, and 16 is:

A. 12

B. 10

C. 8

D. 9

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Correct Answer: Option C

Explanation:
Geometric mean = (4 × 9 × 16)^(1/3) = (576)^(1/3) = 8. It is the nth root of the product of n observations, useful for averaging ratios or growth rates.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The probability that a randomly chosen number from 1 to 100 is divisible by 7 or 11 is:

A. 20/100

B. 23/100

C. 25/100

D. 22/100

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Correct Answer: Option D

Explanation:
Multiples of 7: 14; of 11: 9; of 77: 1. Total = 14+9-1=22. P=22/100.

This question belongs to: Accountancy and Statistics Statistics

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