SSC CGL 31 Aug 2016 Paper

Question : 64 of 100

Marks: +1, -0

The average of makrs of 17 students in an examination was calculated as 71. But it was later found that the mark of one student had been wrongly entered as 65 instead of 56 and another as 24 instead of 50. The correct average is

Validate

Solution:

Total correct marks of 17 students
= 17 × 71 – 65 – 24 + 56 + 50
= 1207 – 89 + 106 = 1224
∴ Required correct average
=

{1224}/{17}

= 72

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