Question

The average marks of a student in 4 subjects is 75. If he gets 80 marks in fifth subject. Find the new average

Answer 1

let the marks of four subjects be x1, x2, x3, and x4......
A/Q-
(x1+x2+x3+x4) /4=75
x1+x2+x3+x4=75×4=300

Now.....
new total marks....
x1+x2+x3+x4+80
=300+80
=380


new average......
380/5=76


76 is the ans of ques