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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 we have to add to make the expected value equal to 8?

 Mar 5, 2022
 #1
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We must add 45 slips with a 9 on them to make the expected value equal to 8.

 Mar 5, 2022
 #2
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(8*3 + 2*9 + n*9)/(n + 10) = 8

 

You can find the number of slips, n, from this.

 Mar 5, 2022

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