Question 1095143
(a+b+c+d+e+f+g+h)/8=79

So a+b+c+d+e+f+g+h=632

In order to get the average score to 80, include 1 more test, call it i

(a+b+c+d+e+f+g+h+i)/9=80

Since a+b+c+d+e+f+g+h=632, we have

(632+i)/9=80

632+i=720

i=88 (Answer)