The average marks in physics lab of a class of students is 55. If the marks of two students were 28 and 25 ofthe actual marks 45 and 50 respectively, then what would be the correct average?
Explanation
According to the question
Sum of the added quantities - Sum of removed quantities= ±Nx
⇒(45+50)-(28+25)=±42×x
⇒ 95-53= 42×x
⇒ x==1
∴ The correct average= 55+1 =56
Hence, Option D is correct.
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