A set of 9 numbers has mean 12. If a number 15 is removed, the new mean is: MCQ with Answer and Explanation

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A set of 9 numbers has mean 12. If a number 15 is removed, the new mean is:

A. 11.625

B. 12.0

C. 11.5

D. 13.0

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum initially = 9 × 12 = 108. After removing 15, sum = 93, n = 8. New mean = 93/8 = 11.625.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

The combined mean of two groups is 55, with n₁=40, mean₁=50. If n₂=60, mean₂ is:

A. 59

B. 58.33

C. 57.5

D. 60

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Correct Answer: Option B

Explanation:
55 = (40×50 + 60×x) / 100 → 2000 + 60x = 5500 → 60x = 3500 → x = 58.33.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Cost of Living Index is primarily used for:

A. Adjusting dearness allowance

B. Calculating GDP

C. Calculating trade balance

D. Measuring industrial production

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Correct Answer: Option A

Explanation:
It is used to adjust salaries and wages to maintain purchasing power.

This question belongs to: Accountancy and Statistics Statistics

Question #3

A woman aged 28 gives birth to a child. Under ASFR calculation, this birth contributes to the age group:

A. 30-34

B. 20-24

C. 28-32

D. 25-29

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Correct Answer: Option D

Explanation:
Standard 5-year age groups: 25-29 includes ages 25 to 29.

This question belongs to: Accountancy and Statistics Statistics

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