The arithmetic mean of 5 numbers is 20. If one number is excluded, the mean of the remaining 4 numbers becomes 18. The excluded number is: MCQ with Answer and Explanation

Question

The arithmetic mean of 5 numbers is 20. If one number is excluded, the mean of the remaining 4 numbers becomes 18. The excluded number is:

A. 30

B. 28

C. 22

D. 20

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum of 5 numbers = 5 × 20 = 100. Sum of 4 numbers = 4 × 18 = 72. Excluded number = 100 - 72 = 28.

This question belongs to: Accountancy and Statistics Statistics

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Statistics Questions

Question #1

Share Report

In a frequency distribution, the class width is computed as:

A. Frequency / total

B. Lower limit + upper limit

C. Upper limit - lower limit (for exclusive classes)

D. Midpoint × 2

View Answer & Solution Discuss

Get Complete Subject PDF for Accountancy and Statistics

Correct Answer: Option C

Explanation:
Class width = difference between boundaries for exclusive classes.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Share Report

Bayes' theorem is often used in:

A. Constructing index numbers

B. Calculating the mean of a sample

C. Updating probabilities after new evidence

D. Testing independence

View Answer & Solution Discuss

Get Complete Subject PDF for Accountancy and Statistics

Correct Answer: Option C

Explanation:
It's used for probabilistic inference and decision making under uncertainty.

This question belongs to: Accountancy and Statistics Statistics

Question #3

Share Report

The median of the dataset: 10, 15, 20, 25, 30, 35 is:

A. 20

B. 30

C. 22.5

D. 25

View Answer & Solution Discuss

Get Complete Subject PDF for Accountancy and Statistics

Correct Answer: Option C

Explanation:
With 6 observations (even), median = average of 3rd and 4th values in ordered list: (20 + 25)/2 = 22.5. This splits the data into two equal halves.

This question belongs to: Accountancy and Statistics Statistics

Explore All Statistics MCQs