Tony’s grades in the Science tests are 82, 76, 85, 88, and 84. What should be his grade on the next test to give him an average grade of 85?
with solution please.
with solution please.
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Answer:
If your goal is 5 tests with an average score of 80, that must mean you must score a total of 5 x 80 points, or 400 points.
Since you already scored 82 + 76 + 88 + 84 = 330 points to date on the first four tests, you must score 400 minus 330 points = 70 points on the last test to achieve your goal.
Step-by-step explanation:
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Verified answer
Let x be the missing grade(82+76+85+88+84+x)/6=85
415+x/6=85
Multiply both sides by 6 to cancel denominator
415+x=510
x=510-410
x=95
He needs a grade of 95 on his next test to have an average of 85.
(64.2+N)/9=8
Multiply both sides by 9
(64.2+N)=72
N=72-64.2
N=7.8
Check:
(11+2+3+3.2+13+14+10+8+N)/9=8
(11+2+3+3.2+13+14+10+8+7.8)/9=8
72/9=8
8=8