Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**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..

Support MathsIsFun.com by clicking on the banners.

What music do I listen to? Clicky click

Offline

**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,319

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**

Offline

**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. }

Why did the vector cross the road?

It wanted to be normal.

Offline

Pages: **1**