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Cory’s average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?

Cory’s average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?
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Cory’s average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?

User Paola
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8*91+78/9 would be an 89.55555 or just 89.56% if you have to round it would be 90%
User David Hodgson
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Average after 8 test is 91%. if he gets a 78% on his 9th test what will be the new acerage
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