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Standard IX

Mathematics

Mean

Brian got gra...

Question

Brian got grades of $92, 89$ and $86$ on his first three math tests. What grade must he get on his final test to have an overall average of $90$ ?

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Solution

The correct option is B 93
Let the grade he got on final test be $x$
The average of all four grades is $90$ .
So, we have $\frac{(92 + 89 + 86 + x)}{4} = 90$
$\Rightarrow x = 360 - 267 = 93$

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Brian got grades of 92,89 and 86 on his first three math tests. What grade must he get on his final test to have an overall average of 90?

The correct option is B 93Let the grade he got on final test be xThe average of all four grades is 90.So, we have (92+89+86+x)4=90⇒x=360−267=93

Brian got grades of $92, 89$ and $86$ on his first three math tests. What grade must he get on his final test to have an overall average of $90$ ?

The correct option is B 93
Let the grade he got on final test be $x$
The average of all four grades is $90$ .
So, we have $\frac{(92 + 89 + 86 + x)}{4} = 90$
$\Rightarrow x = 360 - 267 = 93$