The average of the marks of maths test of 20 student is 9. If the marks of 5 new students are
9,5,3,2,1 the the new average marks is
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Average of 20 students is 9
So total/20 =9
So total marks for 20 students =20x9=180
Total of all 25 students = 180+9+5+3+2+1
=200
So average=200/25 =8
So total/20 =9
So total marks for 20 students =20x9=180
Total of all 25 students = 180+9+5+3+2+1
=200
So average=200/25 =8
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