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Sandra has 4 math tests this marking period. She recieved 90%, 87%, and 92% on the first 3. with is the minimal score she needs on her last test in order to average at least 90% in math class?
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Jul 28, 2022
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Sandra has 4 math tests this marking period. She recieved 90%, 87%, and 92% on the first 3. with is the minimal score she needs on her last test in order to average at least 90% in math class?
Mathematics
high-school
Ozy
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The minim she can get for a score is a 90%
Alex Lowe
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Jul 28, 2022
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Let the unknown score be x
(Sum of the scores)/(number of tests) = avg
(90+87+92+x)/4 = 90
(269+x)/4 = 90
269 + x = 90*4
269 + x = 360
x = 360-269 = 91
So Sandra needs a minimal score of 91% on her last test in order to average at least 90% in math class
I hope this helps :)
Frow
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Aug 2, 2022
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