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**amit****Guest**

you thraw 1 dice until you get K times the number '6'

X = the number of your thraws.

what is P(X) ?

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

Are you looking for the probability to get 6? I don't quite get the question..

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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

When X is less than K, the probability is 0,

Else Binomial distribution would be the answer.

for a single experiment,

P(dice showing 6)=1/6

P(dice not showing 6)=5/6

**X'(y-Xβ)=0**

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

George, Y is right. If X is not an integer or is less than K, then the answer is 0.

Otherwise, it would be [sup]X[/sup]C[sub]K[/sub] * (1/6)[sup]k[/sup] * (5/6)[sup](X-K)[/sup]

{Arbitrary text goes here because the [sub] tag messes up otherwise. }

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It wanted to be normal.

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