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2015-03-02T19:33:52+05:30

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Your scores are : 78, 72, 87 and 90
let fifth score = x
average = 82

82= \frac{78+72+87+90+x}{5} \\ \\ \Rightarrow 82 \times 5=78+72+87+90+x\\ \\ \Rightarrow 410=327+x\\ \\ \Rightarrow 410-327=x\\ \\ \Rightarrow x=83

So you should get atleast 83 to make your average atleast 82.
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  • Brainly User
2015-03-02T21:24:15+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let fifth grade be x
average=a/n+b/n+c/n+.......n /n
so here average =82
applying formula
78/5+72/5+87/5+90/5+x/5 = 82
72+78+87+90+x=82*5
150+177+x=410
327+x=410
x=410-327
x=83
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