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zbz2014

Mathematics

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See attached file. It has a quiz on probability with answers and work done. Let me know if there any any wrong ones

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CHAPTER 4 QUIZ 2
QUESTION 1
A survey of the undergraduates at The University of Nowhere is taken and the results show
that 55% of all undergraduates are female. It is also discovered that 25% of all
undergraduates belong to a Greek organization (fraternity or sorority). When the results are
further examined, it is found that 40% of the males belong to a Greek organization. What is the
probability that one randomly selected undergraduate will be either a female or belong to a
Greek organization?

.55
.73
.80

Table is correct:
Pr(Female or Greek member) = Pr(F or G)
Pr(F or G) = Pr(F) + Pr(G) − Pr(F and G)

.07

Pr(F or G) = 0.55 + 0.25 − 0.07 = 𝟎. 𝟕𝟑

.87

QUESTION 2
An advertising campaign is being developed to promote a new bookstore opening in the newest
mall development. To develop an appropriate mailing list it has been decided to purchase lists
of credit card holders from MasterCard and American Express. Combining the lists they find the
following: 40% of the people on the list have only a MasterCard and 10% have only an American
Express card. Another 20% hold both MasterCard and American Express. Finally, 30% of those
on the list have neither card. Suppose a person on the list is known to have a MasterCard. What
is the probability that person also has an American Express Card?

.20
.33
.18
.70
.90
QUESTION 3
Students will either go to class or not - two possible outcomes. An experiment consists of
randomly selecting 4 students and then following the...


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