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Ch. 5 PROBABILITY Review Flashcards | StudBud
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Ch. 5 PROBABILITY Review
Ch. 5 PROBABILITY Review
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Probability review for AP Statistics
Flashcards
13 cards
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Practice quiz
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Questions
13
Answers
1
What is the probability that you choose a female or someone who prefers movies?
.76
.92
cant answer since categories are not independent.
.6
2
What is probability of picking three red cards in a row out of a deck
without
replacing?
.125
.5
none of these
.117
3
If 60% of seniors have a job, 35% have a car, 20% have both, how many have neither?
25%
huh?
5%
95%
4
P(snow)=.15; P(no heat)=.08. WHS is closed if both occur. If independent, what is P(WHS closed)?
.23
.12
.012
.07
5
Which of the following is false?
If events are independent then P(B|A)=P(B)
if events are disjoint then P(A or B) = P(A)+P(B)
The law of large numbers applies only to long term prob
If replacement occurs events are dependent
6
If P(B|A)=P(B) and P(A|B)=P(A) then
A and B are disjoint
A and B are not independent but is disjoint.
A and B are not independent or disjoint
A and B are independent
7
What is the probability of having 4 children and they are all boys.
.0625
.25
.125
.5
8
If P(A)=.5 and P(B)=.3 what is P(A or B) if A and B are independent. (Be careful)
.65
.8
.5
none of these
9
What is the probability that you choose a boy given that that person chooses sports?
.625
none of these
.32
.5
10
What is the probability of having four children and at least one girl?
.125
.5
.9375
.0625
11
If P(A)=.5 and P(B)=.3 what is P(A or B) if disjoint (mutually exclusive)?
.8
.3
.5
none of these
12
If A and B are independent then
P(A|B)=P(A)
P(A and B)=P(A)P(B)
P(B|A)=P(B)
All of these
13
If P(late to school) = .08, what is prob. that in 5 days you are late at least once?
.92
.32
.341
.08
