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Gamma distribution question

willmoore21

Junior Member
Joined
Jan 26, 2012
Messages
75
1.Let X be a gamma random variable Γ(r = 2, λ = 6). Find the value a such that P(X < a) = 0.95.

I am not sure how to do this.

I think that I use fx(x)=(lambda^r)/R(r)*x^(r-1)exp(-lambdax)

But I'm not sure if I'm supposed to integrate it or what. Maybe this is the wrong formula?

Thanks
 

tkhunny

Moderator
Staff member
Joined
Apr 12, 2005
Messages
9,708
What is fx(x)? What purpose does it serve? How does it work?
 
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