Sarah was trying to figure out her grades for her math course. She only knew the grade of 4 tests she had taken, however the class had taken 5 tests total. She scored a 94, 67, 83 and 93. If Sarah ended up with a grade of 90, what did she get on the 5th and final test?

She has a total of 337 points.

0.9 * 500 = 450

She'd need a score of 113 to get a 90% average. As Steve said about 3 months ago, there must be a typo in the problem.

http://www.jiskha.com/display.cgi?id=1427422976

(94+67+83+93+x)/5 = 90

x + 337 = 450
x = 113

mmmmh, looks like this question is bogus.
She cannot get a 90 average.

That makes four of us to find this problem is faulty. MathMate came to the same conclusion about three weeks ago.

Jay -- please let your teacher know that this problem has an error.

I will let her know first thing Monday morning. Thanks

Thank you. And you're welcome.

To find out what Sarah got on the fifth and final test, we need to use the average grade formula. The average grade is calculated by summing up all the grades and dividing by the total number of grades.

Let's follow these steps to find the answer:

1. Add up the known grades: 94 + 67 + 83 + 93 = 337
2. Since there are 5 tests in total, we need to divide the sum of the grades by 5 to find the average: 337 ÷ 5 = 67.4

Sarah ended up with a total average grade of 90, so we need to calculate the total score she achieved on all five tests:

1. Multiply the average grade (90) by the total number of tests (5): 90 × 5 = 450
2. Subtract the sum of the known grades (337) from the total score to find out what Sarah got on the fifth and final test: 450 - 337 = 113

Therefore, Sarah got a score of 113 on the fifth and final test.