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 />
Examples:<br />
<br />
Back to our quiz, let us use the formula to find:<br />
Px ( 0)<br />
<br />
Px ( 2)<br />
<br />
Px ( 1)<br />
<br />
Px ( 3)<br />
<br />
<br />
Results from the 2000 census show that 42% of U.S. grandparents are the primary<br />
caregivers for their grandchildren (Democrat & Chronicle, “Grandparents as ma and pa,”<br />
July 8, 2002). In a group of 20 grandparents, what is the probability that exactly half are<br />
primary caregivers for their grandchildren? At most 19 are primary caregivers for their<br />
grandchildren?<br />
First let us check if this is a Binomial experiment.<br />
Trials n :<br />
Success:<br />
Failure:<br />
p : q :<br />
x :<br />
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