Binomial Distribution Y13

Question 1

What is the difference between binomial and normal distributions?

Answer 1

Normal distributions model continuous data whereas binomial distributions model discrete data (data which can only take certain values)

Question 2

How do you tackle ‘ double distribution ‘ exam questions?

Answer 2

• Use normal distribution method to find the probability of an event occuring
• Use this probability in the new binomial distribution in the follow-up question

Question 3

When can a binomial distribution be approximated to be a normal distribution?

Answer 3

• When n is large
  (lots of data points)
• When p is close to 0.5