Math 120 Exam 3 Review
This review is only meant to provide you with extra practice problems covered in
the first two chapters.
This is not an exhaustive list of all problems you will see
on the test so be sure to review the problems covered in class and in the
assigned homework problems.
5.1 Definition of Probability
1. Given the experiment of flipping a quarter and rolling a six side die, find:
a. The sample space.
b. The event of rolling a number greater than four.
c. The probability of rolling a number greater than four.
d. The odds of rolling a number greater than four.
2. Given the experiment of drawing a single card from a 52 card deck (ace high),
find:
a. The probability of drawing a 3 and a queen.
b. The probability of drawing a 3 or a queen.
c. The odds of drawing a 3 or a queen.
d. The probability of drawing a card less than 4.
e. The odds of drawing a card less than 4.
3. A jar is filled with four blue marbles, six orange marbles, eight purple marbles,
12 yellow marbles and seven silver marbles. If a single marble is randomly
selected, find:
a. The probability of selecting a blue marble.
b. The odds of selecting a blue marble.
c. The probability of selecting a silver or purple marble.
d. The odds of selecting a silver or purple marble.
4. A jar is filled with 62 black marbles, 49 green marbles, 87 red marbles and 95
clear marbles. If a single marble is drawn from the jar what is the probability
of drawing a red marble?
5.2 Observations about Probabilities
1. If you draw a single card from a 52 card deck (ace high) find:
a. The probability of not drawing a spade.
b. The probability of drawing a red card or a face card.
c. The probability of drawing a red card and a face card.
d. The probability of drawing a spade and not a face card.
2. A necklace and a ring are going to be insured. The insurance company
estimates the probability of the ring being stolen to be 0.05 and the probability
of the necklace being stolen to be 0.03. If they estimate the probability the
ring or the necklace being stolen to be 0.06 find:
a. The probability both are stolen.
b. The probability neither are stolen.
c. The probability only the ring is stolen.
d. The probability only the necklace is stolen.
3. Of the customers that enter a store, 14% need assistance and buy
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View Full Documentsomething, 30% need assistance, and 60% do not need assistance and do
not buy anything. Find:
a. The probability an entering customer will buy something.
b. The probability an entering customer does not need help and will buy
something.
4. A company has a customer base of 2333 customers. 1240 need a duplicate
invoice mailed to a separate address. 1231 need a confirmation email sent
when packages are shipped. 447 need neither of these two services. What
percentage of customers need both services (rounded to the nearest whole
percent)?
a. 18% b. 28% c. 32% d. 25% e. None of these
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 Spring '12
 ShannonMcCool
 Math, Probability, Standard Deviation

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