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#1
12-09-2005, 05:19 AM
 evanski Member Join Date: Jun 2004 Posts: 34
Another Probability Question

If you have 20 coins, 9 of them quarters and 11 nickels. You select 5 coins at random. What is the mean and variance of the number of quarters selected?

Thanks.
#2
12-09-2005, 07:25 AM
 Guest Posts: n/a
Re: Another Probability Question

Mean: 5 * (9/20)
Variance: 5 * (9/20) * (1 - 9/20) * (20 - 5)/(20 - 1)
#3
12-09-2005, 07:51 AM
 evanski Member Join Date: Jun 2004 Posts: 34
Re: Another Probability Question

why?
#4
12-09-2005, 09:02 AM
 Guest Posts: n/a
Re: Another Probability Question

Why not? [img]/images/graemlins/laugh.gif[/img]

Is that a homework question?

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