ceceshelby2635
16.10.2019 •
Mathematics
Average score on first 8 tests is 92, what is the minimum score needed on the ninth test to get an average of 90 in all the tests
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Ответ:
92=s/8 so sum of the first eight test scores is:
s=8(92)=736 now we wish to know the minimum score on the next test that will result in an average of 90...
(736+s)/(8+1)90 multiply both sides by 9
736+s810 subtract 736 from both sides
s74
Thus a score of 74 or more is necessary to maintain an average of at least 90
Ответ:
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Step-by-step explanation:
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