Cory's average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?
How do i figure out this problem?

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01-11-2014
Mathematics

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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?
How do i figure out this problem?

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1.X - 3=0 A.4 B.2 C.0 D.3 E.1 2.X - 15=20 A.35 B.45 C.15 D.10 E.5 3.X - 10=90 A.90 B.100 C.110 D.70 E.80 5.X + 7 =20 A.15 B.20 C.13 D.7 E.14

187Blank 187Blank · Answer 1 · 2014-11-01T06:40:34+01:00

187Blank 187Blank

01-11-2014

You should be able to multiply 91 by 8 to get the sum of the first 8 tests, then add the score on the 9th test. Then to get the average of the sum of the 9 tests you need to divide it by 9.
((91*8)+78)/9=89.555555555555.... So, 90%

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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? How do i figure out this problem?

Respuesta :

Otras preguntas

Cory's average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?
How do i figure out this problem?