Statistics Worksheet With Answer Key Page 18
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20105) A batch consists of 12 defective coils and 88
111) The probability that Luis will pass his statistics
good ones. Find the probability of getting two
test is 0.42. Find the probability that he will fail
good coils when two coils are randomly
his statistics test.
selected if the first selection is replaced before
A) 0.21
B) 0.72
the second is made.
C) 2.38
D) 0.58
A) 0.7744
B) 0.0144
C) 0.176
D) 0.7733
112) If a person is randomly selected, find the
probability that his or her birthday is not in
106) Find the probability that 3 randomly selected
May. Ignore leap years.
people all have the same birthday. Ignore leap
31
334
A)
B)
years.
334
365
A) 0.00000002
B) 0.00000751
31
11
C)
D)
C) 0.0082
D) 0.3333
365
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Is Event B dependent or independent of Event A?
Determine whether the events are mutually exclusive.
107) A: A bird lands on your head.
113) Get a full time day job as a teller with a bank.
B: The bird lays an egg.
Get a full time day job as a cashier at a store.
A) Independent
B) Dependent
A) No
B) Yes
Find the indicated probability.
114) Go to a formal dinner affair.
108) A card is drawn from a well-shuffled deck of
Wear blue jeans.
52 cards. Find P(drawing a face card or a 4).
A) Yes
B) No
4
2
A)
B)
13
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Answer the question.
12
C)
D) 16
115) Suppose you are playing a game of chance. If
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you bet $7 on a certain event, you will collect
$280 (including your $7 bet) if you win. Find
109) The table below describes the smoking habits
the odds used for determining the payoff.
of a group of asthma sufferers.
A) 39 : 1
B) 1 : 39
Occasional
Regular
C) 40 : 1
D) 280 : 287
Nonsmoker
smoker
smoker
Men
370
45
61
Women
443
39
84
Total
813
84
145
If one of the 1119 people is randomly selected,
find the probability of getting a regular or
heavy smoker.
A) 0.450
B) 0.089
C) 0.130
D) 0.198
110) Of the 52 people who answered ʺyesʺ to a
question, 5 were male. Of the 77 people that
answered ʺnoʺ to the question, 11 were male.
If one person is selected at random from the
group, what is the probability that the person
answered ʺyesʺ or was male?
A) 0.096
B) 0.527
C) 0.488
D) 0.124
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