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Bernoulli Distribution

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1 Bernoulli Distribution
A Bernoulli distribution arises from a random experiment which can give rise to just two possible outcomes. These outcomes are usually labeled as either “success” or “failure.” If p denotes the probability of a success and the probability of a failure is (1 - p ), the the Bernoulli probability function is

2 Mean and Variance of a Bernoulli Random Variable
The mean is: And the variance is:

3 Sequences of x Successes in n Trials
The number of sequences with x successes in n independent trials is: Where n! = n x (x – 1) x (n – 2) x x 1 and 0! = 1.

4 Binomial Distribution
Suppose that a random experiment can result in two possible mutually exclusive and collectively exhaustive outcomes, “success” and “failure,” and that  is the probability of a success resulting in a single trial. If n independent trials are carried out, the distribution of the resulting number of successes “x” is called the binomial distribution. Its probability distribution function for the binomial random variable X = x is: P(x successes in n independent trials)= for x = 0, 1, , n

5 Mean and Variance of a Binomial Probability Distribution
Let X be the number of successes in n independent trials, each with probability of success . The x follows a binomial distribution with mean, and variance,

6 Binomial Probabilities - An Example – (Example 5.7)
An insurance broker, Shirley Ferguson, has five contracts, and she believes that for each contract, the probability of making a sale is 0.40. What is the probability that she makes at most one sale? P(at most one sale) = P(X  1) = P(X = 0) + P(X = 1) = = 0.337

7 Binomial Probabilities, n = 100, p =0.40 (Figure 5.10)

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