Negative Binomial

Question 1

Negative Binomial: Written Form and parameters

Answer 1

Let X be the # of trials up to and including the r’th success, X~NB(r,p)

Question 2

Negative Binomial: Equation

Answer 2

i-1 C r-1 * p^r * q^(i-r)

Question 3

Negative Binomial: Mean

Answer 3

r/p

Question 4

Negative Binomial: Variance

Answer 4

r*q/(p^2)