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

Question Report Error

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

A. 11.5

B. 13.0

C. 12.0

D. 11.625

Answer: Option D

Solution (By JKExamLibrary)

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

Discuss this Question (0)

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

Practice More Statistics Questions

Question #1 Report Error

Direct standardization of death rates uses:

A. Crude death rates only

B. Life table functions

C. Age-specific death rates of the standard population

D. Age-specific death rates of the given populations applied to a standard age distribution

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Direct standardization applies the observed age-specific rates to a standard population distribution.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

The graph of a cumulative frequency distribution is called:

A. Frequency curve

B. Pie chart

C. Ogive

D. Histogram

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
An ogive is a line graph that represents cumulative frequencies.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

A box contains 4 white and 6 black balls. A ball is drawn and not replaced. Then another ball is drawn. The probability that both are white is:

A. 1/6

B. 6/90

C. 2/15

D. 12/90

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
(4/10)×(3/9)=12/90=2/15.

This question belongs to: Accountancy and Statistics Statistics

Explore All Statistics MCQs