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Unit 4 prob review Flashcards | StudBud
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Unit 4 prob review
Unit 4 prob review
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1
What is the probability of rolling an even number and flipping a heads?
P(a)+P(b)-P(a∩b)
P(a)*P(b|a)
P(a)+P(b)
P(a)*P(b)
2
About 8% of males are colorblind. With unrelated men, how many do we expect to ask before finding someone colorbilnd?
E(x) = np
E(x) = 1/p
none of the above
E(x) = Σxp
3
You want to know in a 5-card hand, how many combinations are there of 3 face cards and 2 nonface cards?
\sqrt{npq}
\frac{n!}{k!\left(n-k\right)!}
\frac{n!}{k!\left(n-k\right)!}p^nq^{k-n}
q^{n-1}p
4
An icecream stand claims 12% of the cones they sell are jumbo size. What's P( 1st jumbo cone is the 4th cone)?
Binomial
Geometric
Multiplication rule
addition rule
5
A basketball player has a 75% Freethrow rate. What is the probability that her first basket is at most her 3rd shot?
Binomcdf (.75, 3)
Binompdf(.75, 3)
Geometcdf (.75 , 3)
Geometpdf(.75, 3)
6
62% of all sales are made by credit card. you expect 12.4 out of 20 sales to be by card. what is the standard deviation?
\frac{n!}{k!\left(n-k\right)!}
q^{n-1}p
\sqrt{npq}
\frac{n!}{k!\left(n-k\right)!}p^nq^{k-n}
7
AP Stats students have a 77% homework completion rate. What is P(at most 18 students did thier homework today)?
Binomcdf (33, .77, 18)
Geometcdf (33, .77, 18)
Binompdf (33, .77, 18)
Geometpdf (33, .77, 18)
8
Assume that 18% of people are left handed. If we select 9 people at random, what is P(exactly 4 lefties in the group)?
addition rule
Multiplication rule
Binomial
Geometric
9
UMD claims that 72% of the senior athletes graduate that year. out of 250 athletes, how many do we expect to graduate?
E(x) = np
none of the above
E(x) = 1/p
E(x) = Σxp
10
Suppose 3% of CDs are defective. What is the probability we have to check 25 cds before we find a defective one?
Geometpdf( .03, 25)
Binompdf (25, .03, 1)
Geometcdf (.03, 25)
Binomcdf (25, .03, 1)
11
What is the probability that a randomly selected student has a first name or a last name that starts with a vowel?
P(a)*P(b|a)
P(a)+P(b)
P(a)*P(b)
P(a)+P(b)-P(a∩b)
12
A family has 2 children. What is the probability that both children have blue eyes?
P(a)*P(b|a)
P(a)+P(b)-P(a∩b)
P(a)*P(b)
P(a)+P(b)
13
62% of all purchases are made by credit card. You made 20 sales in your shift. what is P(15 sales were by credit card)
\frac{n!}{k!\left(n-k\right)!}p^nq^{k-n}
\sqrt{npq}
\frac{n!}{k!\left(n-k\right)!}
q^{n-1}p
14
When flipping a coin 100 times, what is the probability of getting tails exactly 58 times?
Binompdf ( 100, .5 , 58)
Geometpdf (100, 58)
Geometcdf(100, 58)
Binomcdf(100, .5, 58)
15
when rolling a fair die, what is the probability that the first 4 you roll is at least the 7th roll?
Binomcdf(7, 1/6, 4)
1- geometcdf( 1/6, 7)
1-Binomcdf(7, 1/6, 4)
Geometcdf (1/6, 7)
16
There is a 45% chance that puppies in the 6 puppy litter are male. What is the probability at least 1 puppy is male?
Geometcdf(6, .45, 1)
Binomcdf(6, .45, 1)
1 - binomcdf(6, .45, 0)
1- geometcdf(6, .45,0)
17
5 juniors and 4 seniors have applied for 2 open student council positions. What is P(both juniors or both seniors)?
Geometric
addition rule
Binomial
Multiplication rule
18
Find the expected value
E(x) = 1/p
E(x) = Σxp
none
E(x) = np
