SOLUTION: Your quiz grades are 73, 75, 89, and 91. What is the lowest grade you can obtain on the last quiz and still achieve an average of at least of at 85? Solve.

Question 230426: Your quiz grades are 73, 75, 89, and 91. What is the lowest grade you can obtain on the last quiz and still achieve an average of at least of at 85? Solve.
Answer by texttutoring(324) (Show Source): You can put this solution on YOUR website!
Let x = the lowest grade you can obtain on the last quiz.
Use the formula for average (add the scores up and divide by the number of scores). The last quiz, score x, will give us 5 test scores in total.
(73+75+89+91+x)/5 = 85
73+75+89+91+x=425
328+x=425
x=97
The lowest grade you can obtain is 97 if you want to have an average of at least 85.
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