The average marks of 25 students is 70. If the marks of one student were misread as 80 instead of 60, find the correct average. MCQ with Answer and Explanation

Question

The average marks of 25 students is 70. If the marks of one student were misread as 80 instead of 60, find the correct average.

A. 70.0

B. 68.8

C. 69.8

D. 69.2

Answer: Option D

Solution (By JKSSB Mock Tests)

Total sum misread =25×70=1750. Correct sum =1750 -80 +60 =1730. Correct average =1730/25=69.2.

This question belongs to: Maths Average

Request complete Subject PDF

Discuss this Question (0)

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

Practice More Average Questions

Question #1

Share Report

Average of 9 numbers 290. If average of 6 is 285, average of remaining 3?

A. 300

B. 295

C. 298

D. 305

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum9=2610. Sum6=1710. Remaining=900. Average=300.

This question belongs to: Maths Average

Question #2

Share Report

Average of 1305,1740,2175 is

A. 1735

B. 1740

C. 1750

D. 1730

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
5220/3=1740.

This question belongs to: Maths Average

Question #3

Share Report

The average of 20 numbers is 45. Later it was found that 52 was wrongly taken as 25. What is the correct average?

A. 46

B. 46.35

C. 45.35

D. 47

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Error = 52-25=27 too less. Correct sum = old sum +27. Old sum=20×45=900. New sum=927. Average=927/20=46.35.

This question belongs to: Maths Average

Explore All Average MCQs