Final#17.pdf - Print Test 12:08 AM PRINTABLE VERSION Final...

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Final
You scored 43 out of 50
Question 1
Your answer is CORRECT.
Suppose that in a large metropolitan area, 82% of all households have cable tv. Suppose you are
interested in selecting a group of six households from this area. Let X be the number of households in
a group of six households from this area that have cable tv. For what proportion of groups will at most
three of the households have cable tv?
a) 0.924
b)
0.400
c)
0.696
d)
0.304
e)
0.076
Question 2
Your answer is CORRECT.
A potato chip company calculated that there is a mean of 73.5 broken potato chips in each production
run with a standard deviation of 5.2. If the distribution is approximately normal, find the probability
that there will be fewer than 69 broken chips in a run.
Question 3
Your answer is CORRECT.

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A distribution of grades in an introductory statistics class (where A = 4, B = 3, etc) is:
0 1 2 3 4
0.1 0.19 0.2 0.31
Find the mean and variance for the grades in this class.
0.2
Question 4
Your answer is INCORRECT.
The weights of male and female students in a class are summarized in the following boxplots:
Which of the following is NOT correct?
Question 5
Your answer is CORRECT.
Given that , find .
x
p ( x )
P ( A ) = 0.33, P ( B ) = 0.44, and P ( A ∩ B ) = 0.18 P ( A | B )

12/12/17, 12 : 08 AM Print Test
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a) 0.545
b)
0.409
c)
0.145
d)
0.855
e)
0.591