Binomial Distribution: Saving Time when Calculating the Mean & Variance

This is the second in a series of three videos looking at how the Normal Ditribution approximates to the Binomial Distribution.
The links to all three videos can be found here:
Calaculating the Binomial Distribution Probabilities: • Binomial Distribution:...
Calcualtion of E[X] and Var[X]: • Binomial Distribution:...
Calaculating the Normal Distribution Probabilities: • Binomial Distribution:...