Chapter 5 Probability Distributions (Discrete Variables)
Chapter 5 Probability Distributions (Discrete Variables)
Chapter 5 Probability Distributions (Discrete Variables)
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MTH 160<br />
Statistics I<br />
Brigitte Martineau <strong>Chapter</strong> 5<br />
2) A die is rolled 20 times and the number of “fives” that occurred is reported as the random<br />
variable. Explain why x is a binomial random variable.<br />
<br />
Trials<br />
n :<br />
Success: Failure:<br />
p : q :<br />
x :<br />
The Binomial <strong>Probability</strong> Function<br />
n<br />
x nx<br />
P( x) p q , for x 0,1,2,3,...<br />
x<br />
<br />
What is n <br />
?<br />
x<br />
<br />
What is<br />
p x ?<br />
What is q n x ?<br />
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