Question

The average marks of 20 students was 45. If the marks of 10 students were taken as 40 in place of 50, find the correct average.

35

90

75

50


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Answer 1

Answer:

50 is the average

Step-by-step explanation:

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Answer 2

Answer:

The correct average is 50.

Step-by-step explanation:

The average marks of 20 students is 45

So, the total marks is 900

Now say, the marks of 10 students is taken as 40 initially so the total marks of these 10 students is 400.

When their correct marks is 50, the total of these 10 students is 500 so we can observe that there's a difference of 100 between the two total marks.

Hence, we add this to the initial total which is 900.

So after considering the correct marks of the 10 students as 50, the outstanding total becomes 1000.

Therefore the new average is 1000/20 = 50.