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MAT 155 Chapter 5
The following is a brief review of Chapter 4. This
does NOT cover all the material in that
chapter.
Click on Slide Show and View Slide Show.
Read and note your answer to the question.
Advance the slide to see the answer.
Thanks to Ms. Valerie Melvin for her portion of this review.
Dr. Claude Moore, Math Instructor, CFCC
Identify the given variable as being
discrete or continuous: the number of
oil spills off the Alaskan coast.
1. Continuous
2. Discrete
0%
1
0%
x
0
Determine if the
1
following represents
2
a probability distribution: 3
4
5
50%
50%
1. Yes
2. No
1
2
P(x)
0.243
0.167
0.213
0.149
0.232
0.164
Find the mean of the
following probability
distribution:
1.
2.
3.
4.
1.5
1.7
1.6
2.0
25%
1.
25%
25%
2.
3.
25%
4.
x
0
1
2
3
4
P(x)
0.1296
0.3456
0.3456
0.1536
0.0256
A contractor is considering a sale that
promises a profit of $38,000 with a
probability of 0.7 or a loss (due to bad
weather, strikes and such) of $16,000 with
a probability of 0.3. What is the expected
profit?
1.
2.
3.
4.
$26,600
$22,000
$37,800
$21,800
25%
1
25%
25%
2
3
25%
4
In the United States, 25% of the population
have green eyes. If 12 people are
randomly selected, what is the probability
that exactly 5 of them have green eyes?
25%
1.
2.
3.
4.
0.103
0.082
0.091
0.027
1.
25%
25%
2.
3.
25%
4.
The number of calls received by a car towing
service averages 16.8 per day (per 24 hour
period). After finding the mean number of calls
per hour, use a Poisson Distribution to find the
probability that in a randomly selected hour, the
number of calls is 2.
25%
1.
2.
3.
4.
0.0852
0.134
0.122
0.152
1.
25%
25%
2.
3.
25%
4.
Mars, Inc., claims that 24% of its M&M plain
candies are blue. A sample of 100 M&Ms is
randomly selected. Find the standard deviation
for the numbers of blue M&Ms in such groups of
100.
1.
2.
3.
4.
18.24
4.27
24.0
4.54
25%
1.
25%
25%
2.
3.
25%
4.
If boys and girls are equally likely and
groups of 400 births are randomly
selected, find the mean numbers of girls in
such groups of 400.
1.
2.
3.
4.
200
14.14
100
10
25%
1
25%
25%
2.
3
25%
4
The brand name of McDonalds has a 95%
recognition rate. In a random sample of 15
customers, find the probability that the
number who recognize the brand name is
not 13.
1.
2.
3.
4.
0.135
0.865
0.829
0.171
25%
1.
25%
25%
2.
3.
25%
4.