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Suppose we have a bag with 10 slips of paper in it. Eight slips have a 3 on them and the other two have a 9 on them.

How many 's do we have to add to make the expected value equal to 6?

 Mar 7, 2022
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I will assume the question is supposed to be a 9. 

 

We can write as equation:

 

\(3 \times 8 + 9 \times 2 + 9x = 6(10+x)\)

\(42 + 9x = 60 + 6x\)

\(18 = 3x\)

\(x = \color{brown}\boxed{6}\)

 Mar 7, 2022

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