Answer:
78%
Explanation:
You want to know the grade Emily needs on her 5th test to earn an average score of 90%, given her first 4 tests had grades 92%, 87%, 95%, 98%.
Average
Emily's average grade is the sum of the test scores divided by their number. She wants that to be 90:
(92 +87 +95 +98 +x)/5 = 90
x + 372 = 450 . . . . . . . . . multiply by 5
x = 78 . . . . . . . . . . . . . subtract 372
Emily must score 78% on her 5th test to get the grade she wants.
<95141404393>