According to Infoplease, 18.8% of the luxury cars
manufactured in 2003 were silver. A large car
dealership typically sells 50 luxury cars a month. If X
represents the number of silver luxury cars sold in a
typical month and the model is Binomial, what is the
expected value of X?
10
1. 7.63
2. 9.4
3. 40.6
4. 2.76
0%
1.
0%
2.
0%
3.
0%
4.
According to Infoplease, 18.8% of the luxury cars
manufactured in 2003 were silver. A large car
dealership typically sells 50 luxury cars a month. If X
represents the number of silver luxury cars sold in a
typical month and the model is Binomial, what is the
standard deviation of X?
10
1. 7.63
2. 9.4
3. 40.6
4. 2.76
0%
1.
0%
2.
0%
3.
0%
4.
Suppose the probability of a dropped cell phone
call is 0.05. If we want to determine the
probability that 2 out of the next 20 calls placed
on a cell will drop, what probability model
should we use?
10
1.
2.
3.
4.
5.
Equally likely
Binomial
Complementary
Geometric
Subjective
0%
1
0%
0%
2
3
0%
0%
4
5
Suppose the probability of a dropped cell phone
call is 0.05. What is the probability that 2 out of
the next 20 calls placed on a cell phone will
drop?
10
1.
2.
3.
4.
5.
0.925
0.736
0.189
0.075
0.567
0%
1.
0%
0%
2.
3.
0%
0%
4.
5.
In a taste test of Pepsi vs Coke, suppose 25% of tasters
can distinguish between the colas. If 20 tasters
participate in a test by drinking from 2 cups in which 1
cup contains Coke and the other cup contains Pepsi,
what is the probability that at least 5 (that is, 5 or
more) will correctly identify the colas?
10
1.
2.
3.
4.
5.
0.617
0.383
0.415
0.585
0.202
0%
1.
0%
0%
2.
3.
0%
0%
4.
5.
If 65% of college students have opened a new credit
card account within the past year, how many students
would you expect to survey before finding one who has
not opened a new account in the past year?
10
1.
2.
3.
4.
5.
0.65
1.54
2.86
0.35
6.5
0%
1.
0%
0%
2.
3.
0%
0%
4.
5.
Suppose 65% of college students have opened a new
credit card account within the past year. If you survey
students in the brickyard, what is the probability that
the first student who has not opened a new credit card
account in the past year is the 3rd student that you
survey?
10
1.
2.
3.
4.
5.
0.275
0.148
0.0796
0.043
0.096
0%
1.
0%
0%
2.
3.
0%
0%
4.
5.
Dewey, Lie, and Howe, Inc., a tax preparation firm,
makes fraudulent claims on 47% of the tax returns that
they file with the IRS. If the IRS audits Dewey, Lie, and
Howe, Inc., what is the probability that the first
fraudulent return found by the IRS is the 5th return that
they examine?
10
1.
2.
3.
4.
5.
0.023
0.042
0.026
0.037
0.094
0%
1.
0%
0%
2.
3.
0%
0%
4.
5.