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easyMCQUPTET Paper 2 (Maths & Science)2018Mathematics and Science
1 mark

In an examination, the mean of marks scored by a class of students was calculated as . Later on, it was detected that the marks of one student was wrongly copied as instead of . Find the correct mean.

  1. A
  2. B
  3. C
  4. D

Solution & Step-by-step Explanation

1. Calculate the initial incorrect sum of marks for the 30 students:
Correct the sum by subtracting the wrong value and adding the correct value:

Calculate the correct mean:

Practice this question

Try it yourself before checking the explanation above.

In an examination, the mean of marks scored by a class of students was calculated as . Later on, it was detected that the marks of one student was wrongly copied as instead of . Find the correct mean.
A
B
C
D

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