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Chapter 8: Discrete Probability Distributions
Example 8-23
:
What is the expected value of the number of students who
will not be served alcoholic beverages by the waiter in
Example 8-22
?
Solution:
Since
then
= 8
5/12 = 3.3333 (to four decimal places).
That is, if the waiter repeatedly randomly checks the IDs of 8 students from
a sample of size 12, on average, the waiter will not serve alcoholic beverages
to 3.3333 of the students.
Figure 8-30
shows that the mean is 3.3333.
Section Review
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