Question

The average marks of 50 students in an examination was 65.it was later found that the marks of one student had been wrongly entered as 83 instead of 38.the correct average is ?​

Answer 1

Answer:

The average marks of all the student must be 63.89

Step-by-step explanation:

As we have given in the question that average marks of 50 students=65

But marks of 1 student has been incorrect, It has been written 83 instead of 38, Therefore now we need to find the new average marks of the class

As the difference between the incorrect marks were=$83-38=45$

So if we distribute this difference of 45 among 50 students it must come as

=$\dfrac{50}{45}=1.11$

Therefore 1.11 marks should be deducted from the given average

So the final answer would be

$65-1.11=63.89$