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- anonymous

a box contains five one dollar bills, nine five dollar bills, ten ten dollar bills, and nine twenty dollar bills. what is the expectation if one bill is selected.
$10.00
$9.00
$11.00
$12.00

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- anonymous

- katieb

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- Loser66

Please, post the original question by scanning. The options are not the correct one because it doesn't link to the problem.

- anonymous

what do you mean?

- dan815

|dw:1435147951289:dw|

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- dan815

tells you the money on average per bill

- Loser66

dan, expectation mean probability, right?

- dan815

expectation is the mean of this set yes

- Loser66

so, the options should be % form, right?

- dan815

its the mean of {1,1,1,1,1,5,5,5,5,5,5,...5,10,10,10...10,20,20,20,20..,20}
its mean of that set

- dan815

no its not a probability, it is the mean value

- Loser66

ok, I should shut up to learn more, hehehehe... I am waiting for your explanation, please

- dan815

thats it, its how to find average of these numbers

- dan815

here is a simpler example
if u have a set
{1,2,2,3,3,3,4}
what is the expected value?

- dan815

to do that you would add up all the numbers and divided by the number of numbers

- dan815

same thing with this example

- dan815

we are just finding average of this set

- anonymous

so if I pull one bill whats my answer or how do I figure it out?

- dan815

|dw:1435148300369:dw|

- anonymous

that was painfully simple.

- Loser66

But it is simple to the person who knows it like dan, not to me.

- dan815

hahah u know it too

- dan815

this is the theory behind finding average height of function and center x and y of areas

- anonymous

The book never went over that in the chapter, I have no idea how I was supposed to know it.

- dan815

center of masses

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