I keep having a hard time with this, so any help would be appreciated.
What is the equation to figuring out the probability distribution?
I have to draw from a hat of marbles, in which 4 are ordinary marbles and one is the coveted "Golden Marble" I want to obtain. I am drawing the marbles with replacement... Let X be the number of attempts I make... what is my probability distribution of X?
I know for the 1st one my probability is 1/5 or 20%
X1= .2
I saw online the formula was...
P(K out of N) = N!/ K!(N-K)! (P^K)(q^N-K)
Where:
N = number of opportunities for event ‘X’ to occur
K = number of times ‘X’ is stipulated to occur
P = probability event ‘X’ will occur on any particular occasion
q = probability event ‘X’ will not occur on any particular occasion
When I tried this for X2 I got...
5!/2! (5-2)! (.2^2)(.8^5-2)
120/2 (6) (.04) (.512)
120/.24576 = 29
That's obviously incorrect...
What is the equation to figuring out the probability distribution?
I have to draw from a hat of marbles, in which 4 are ordinary marbles and one is the coveted "Golden Marble" I want to obtain. I am drawing the marbles with replacement... Let X be the number of attempts I make... what is my probability distribution of X?
I know for the 1st one my probability is 1/5 or 20%
X1= .2
I saw online the formula was...
P(K out of N) = N!/ K!(N-K)! (P^K)(q^N-K)
Where:
N = number of opportunities for event ‘X’ to occur
K = number of times ‘X’ is stipulated to occur
P = probability event ‘X’ will occur on any particular occasion
q = probability event ‘X’ will not occur on any particular occasion
When I tried this for X2 I got...
5!/2! (5-2)! (.2^2)(.8^5-2)
120/2 (6) (.04) (.512)
120/.24576 = 29
That's obviously incorrect...
:|
So I take it the equation I found was wrong... any help?