SOLUTION: If my exam grades are 79, 93, 91, and 68, what grade would I need on my next exam to have an average of 80? I need to learn how to work this problem.
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Question 702422: If my exam grades are 79, 93, 91, and 68, what grade would I need on my next exam to have an average of 80? I need to learn how to work this problem.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
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.
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