Binomial Distribution

Properties of a Binomial Distribution:

• A fixed chance of success. (Probability p)
• Only one other outcome, failure. (Probability 1-p)
• A fixed number of trials. (n) 
• The trials are independent. 

Formula:

P(r successes in n trials) = nCr x pr x (1-p)n-r

Example (taken from MyMaths):

 Rob has a faulty alarm clock and is late for school 20% of the time.

In one school week, what is the probability that he is late on 3 days?

So...

• Success (p) = 0.2
• Failure (1-p) = 1 - 0.2 = 0.8
• Number of…