SOLUTION: please help me solve this question, on averages and range : " a pupil has taken four exams and his mean score is 45%. In his next exam (his fifth exam) he only scores 20%. Find his

Algebra ->  Average -> SOLUTION: please help me solve this question, on averages and range : " a pupil has taken four exams and his mean score is 45%. In his next exam (his fifth exam) he only scores 20%. Find his      Log On


   

Question 1077356: please help me solve this question, on averages and range : " a pupil has taken four exams and his mean score is 45%. In his next exam (his fifth exam) he only scores 20%. Find his mean mark for all five exams. " thankyou..
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28A%2BB%2BC%2BD%29%2F4=45
A%2BB%2BC%2BD=180
So then,
A%2BB%2BC%2BD%2BE=180%2B20
A%2BB%2BC%2BD%2BE=200
and
%28A%2BB%2BC%2BD%2BE%29%2F5=200%2F5
%28A%2BB%2BC%2BD%2BE%29%2F5=40
Th new average is 40%.