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Standard Deviation watch

1. A fair die is rolled 36 times. What is the standard deviation of the even number (2, 4 or 6) outcomes?

Can someone help me as to point out what formula to use and how to use it?
2. Anyone?
3. 18
4. (Original post by partoftheweekend)
18
I thought I got there in the end but my answer was different.
I did 0.5*36 = 18. Then 18*(1-0.5) = 9. Then square root of 9 which was 3. I'm assuming that is wrong now?
5. Im joking

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Updated: February 7, 2010
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