Changes

p</math><math>=\frac{p}{(1-q)^2}= \frac{1}{p}</math>

p</math><math>=\frac{p}{(1-q)^2}= \frac{1}{p}</math>

Similarly, the variance can be calculated:

The variance can be calculated similarly:

<math>Var(X) = \frac{1-p}{p^2}</math>

<math>Var(X) = \frac{1-p}{p^2}</math>.