Question #253eb

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Answer 1 · 2016-01-25T02:33:32

Use the following variables ...

T = sum of the thrown out scores
N = sum of the not thrown out scores

$\frac{T + N}{10} = 70$ $(T+N)/10=70$

$\frac{N}{6} = 75$ $N/6=75$

$N = 75 \times 6 = 450$ $N=75xx6=450$

Now substitute back into the first equation and solve for T ...

$\frac{T + N}{10} = 70$ $(T+N)/10=70$

$\frac{T + 450}{10} = 70$ $(T+450)/10=70$

$T + 450 = 70 \times 10 = 700$ $T+450=70xx10=700$

$T = 700 - 450 = 250$ $T=700-450=250$

Finally, we can find the average of the 4 thrown out scores ...

average $= \frac{T}{4} = \frac{250}{4} = 62.5$ $=T/4=250/4=62.5$

hope that helped