If the mean of 10 numbers is 15, and one number is removed making the new mean 14, the removed number is: MCQ with Answer and Explanation

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If the mean of 10 numbers is 15, and one number is removed making the new mean 14, the removed number is:

A. 15

B. 24

C. 20

D. 14

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum initially 150, after removal sum=9×14=126, removed = 150-126=24.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

An ogive is used to determine:

A. Median

B. Mode

C. Mean

D. Standard deviation

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Correct Answer: Option A

Explanation:
The median can be read from the ogive at the N/2 cumulative frequency.

This question belongs to: Accountancy and Statistics Statistics

Question #2

According to Sturges' rule, the approximate number of classes for n = 50 is: (Use k = 1 + 3.322 log₁₀ n)

A. 6

B. 8

C. 7

D. 5

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Correct Answer: Option C

Explanation:
log₁₀50 ≈ 1.699; 3.322 × 1.699 ≈ 5.64; 1 + 5.64 = 6.64, which rounds to 7 classes.

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Question #3

Which of the following is a direct source of demographic data in India?

A. National Sample Survey (NSS)

B. Economic Survey

C. Annual Report of RBI

D. Census of India

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Correct Answer: Option D

Explanation:
Census is the primary source of demographic data; NSS also provides demographic data but census is the most direct comprehensive source.

This question belongs to: Accountancy and Statistics Statistics

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