10. Mary has received the following grades on her first 4Math tests: 8

1.	10. Mary has received the following grades on her first 4Math tests: 87, 93, 91 and 88. What grade must shereceive on her 5th test to have an average of 90 in theclass?Ans.
Answer» Answer: LET the MARK's obtained in her 5th test be x since, average mark=sum of all marks/total no of test hence, 90=87+93+91+88+x/5 :》90=359+x/5 :》90×5-359=x :》450-359=x :》x=91 hence, Mary GOT 91 Mark's in her 5th test

10. Mary has received the following grades on her first 4Math tests: 87, 93, 91 and 88. What grade must shereceive on her 5th test to have an average of 90 in theclass?Ans.

Answer»

Answer:

LET the MARK's obtained in her 5th test be x

since, average mark=sum of all marks/total no of test

hence, 90=87+93+91+88+x/5

:》90=359+x/5

:》90×5-359=x

:》450-359=x

:》x=91

hence, Mary GOT 91 Mark's in her 5th test

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10. Mary has received the following grades on her first 4Math tests: 87, 93, 91 and 88. What grade must shereceive on her 5th test to have an average of 90 in theclass?Ans.​

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10. Mary has received the following grades on her first 4Math tests: 87, 93, 91 and 88. What grade must shereceive on her 5th test to have an average of 90 in theclass?Ans.