Question 702422
Let x = next exam grade


Add up the grades, divide by 5 to average them, then set that equal to the desired average grade of 80


(79+93+91+68+x)/5 = 80


Now solve for x


(79+93+91+68+x)/5 = 80


79+93+91+68+x = 80*5


79+93+91+68+x = 400


331+x = 400


x = 400 - 331


x = 69


So you need a 69 on the next exam to get an average of 80. If you score higher than 69, then your average will be larger than 80.