Re: probability question

Now I got it ...........
I can't thank you enough.
Want another one?
You make a $1 bet on a NY lottery Quick Draw game where you select 5
numbers. If all of your numbers match the winning numbers you will receive
$300, with a probability.0006. If 4 out of 5 numbers match you will receive
$20, with a probability.0121. If 3 out of 5 numbers match you will receive
$2, with probability of .0839. You lose your $1 otherwise. Create the
probability distribution for this experiment where the random variable is
your net winnings(+)Losses(-). Then find the expected value (mean).
If you are so inclined to do this please show me how it works.
Andrew


""Luis A. Afonso"" <licas_@xxxxxxxxxxx> wrote in message
news:1043729.1140803478205.JavaMail.jakarta@xxxxxxxxxxxxxxxxxxxxxxxxx
Andrew Schuyler said :


*** you mistakenly put 3 dried out markers in a drawer that contained 7
good markers. There are now 10 markers in the drawer. If you randomly
select 3 markers (without replacement), what is the probability they are
both dried out. Please show work
Thanks. Andrew***

My response

The model is the Hipergeometric one.

___p= 3C3*7C0 / 10C3 = (1*1) / 10C3

___10C3 = (10! )/ ((10-3)!*3!)=
___= (10*9*8) /(3*2*1) = 120

Therefore p= 1/ 120 = 0.0833333. = 8.3% (to read the theory is
important).


________licas (Luis A. Afonso)


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