If the arithmetic mean of 8, 12, x, 6, 9 is 8, then x is: MCQ with Answer and Explanation

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If the arithmetic mean of 8, 12, x, 6, 9 is 8, then x is:

A. 4

B. 7

C. 5

D. 8

Answer: Option C

Solution (By JKSSB Mock Tests)

(8+12+x+6+9)/5 = 8 → 35 + x = 40 → x = 5.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Infant Mortality Rate (IMR) is calculated as:

A. Deaths under 1 year / Mid-year population under 1 × 1,000

B. Deaths under 1 year / Total births × 1,000

C. Maternal deaths / Live births × 100,000

D. Deaths under 5 years / Live births × 1,000

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Correct Answer: Option B

Explanation:
IMR = (Number of infant deaths (under 1 year) in a year / Number of live births in the same year) × 1,000. It is a sensitive indicator of healthcare quality and socioeconomic conditions.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If P(A)=0.4, P(B)=0.5, and A and B are independent, then P(A∪B) is:

A. 0.5

B. 0.2

C. 0.9

D. 0.7

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Correct Answer: Option D

Explanation:
0.4+0.5 - (0.4×0.5)=0.9-0.2=0.7.

This question belongs to: Accountancy and Statistics Statistics

Question #3

The primary purpose of the Consumer Price Index (CPI) is to measure:

A. Changes in the retail prices of a fixed basket of consumer goods and services

B. Producer cost inflation

C. Export price competitiveness

D. Wholesale market price trends

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Correct Answer: Option A

Explanation:
CPI tracks the average price change over time for a representative basket of goods and services purchased by households, serving as the main gauge of consumer inflation.

This question belongs to: Accountancy and Statistics Statistics

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