anonymous
  • anonymous
A box contains nine $1 bills, eight $5 bills, two $10 bills, and four $20 bills. What is the expectation if one bill is selected?
Probability
jamiebookeater
  • jamiebookeater
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texaschic101
  • texaschic101
The expectation is probably a $1 bill because there is more of them. There is a total of (9 + 8 + 2 + 4) = 23 bills. The chance of getting a $1 is 9/23, the chance of getting a $5 bill is 8/23, the chance of getting a $10 is 2/23, and the chance of getting a $20 is 4/23.
whpalmer4
  • whpalmer4
The expectation (or expected value) is the sum of the probabilities multiplied by the payoffs. So \[\frac{9}{23} * $1 + \frac{8}{23}*$5 + ...\]
anonymous
  • anonymous
1/24

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