Q: , John's marks were wrongly entered as 83 instead of 63. If the average marks calculated for the whole class increased by half, then find the number of students in the class  

Answer: C

In this question, we are given that John's marks were wrongly entered as 83 instead of 63 and that the average marks for the whole class increased by half as a result.
We are asked to find the number of students in the class.
To solve this problem,
we can first assume the number of students in the class to be x.
We know that the total increase in marks for x students is x/2,
since the average increase is 1/2.
We can then use this information to find the value of x by setting up an equation using the given information.
Specifically, we can set up the equation x/2 = 83 - 63,
which gives us x = 40 students.
This means that there are 40 students in the class.

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