The arithmetic mean of the numbers 12, 18, 24, and 30 is: MCQ with Answer and Explanation

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The arithmetic mean of the numbers 12, 18, 24, and 30 is:

A. 22

B. 20

C. 21

D. 24

Answer: Option C

Solution (By JKSSB Mock Tests)

Arithmetic mean = (12 + 18 + 24 + 30) / 4 = 84 / 4 = 21. This is the sum of observations divided by the number of observations.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Which of the following statements about the Census of India is correct?

A. It uses the de jure method of enumeration.

B. It is conducted every 5 years.

C. It covers only the rural population.

D. It does not collect literacy data.

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Correct Answer: Option A

Explanation:
Indian census uses the de jure (usual residence) method. It is decennial, covers whole country, collects literacy.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Which measure of central tendency is most affected by extreme values?

A. Mode

B. Arithmetic mean

C. Median

D. Geometric mean

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Correct Answer: Option B

Explanation:
The arithmetic mean uses all values and is pulled towards outliers.

This question belongs to: Accountancy and Statistics Statistics

Question #3

Which of the following about Census 2011 is incorrect?

A. It was the 15th Census of India.

B. The sex ratio was 940 females per 1000 males.

C. The literacy rate was 74.04%.

D. The population was 1.21 billion.

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Correct Answer: Option B

Explanation:
Sex ratio was 943, not 940.

This question belongs to: Accountancy and Statistics Statistics

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