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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 9's do I have to add before the expected value is at least 8?

 Mar 7, 2022
 #2
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Write as equation: 

 

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

\(42+ 9x=80+8x\)

\(42+x=80\)

\(x =\color{brown}\boxed{ 38}\)

 Mar 7, 2022

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