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You scored 43 out of 50
Question 1Your answer is INCORRECT.Suppose that in a large metropolitan area, 89% of all households havecable tv. Suppose you are interested in selecting a group of sixhouseholds from this area. Let X be the number of households in agroup of six households from this area that have cable tv. For whatproportion of groups will at most two of the households have cable tv?
a) 0.979b) 0.998c) 0.019d) 0.021e) 0.002
Question 2Your answer is CORRECT.A potato chip company calculated that there is a mean of 75.4 brokenpotato chips in each production run with a standard deviation of 5.2. Ifthe distribution is approximately normal, find the probability that therewill be fewer than 66 broken chips in a run.
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b)
0.335
c)
0.018
d)
0.285
e)
0.965
Question 3Your answer is CORRECT.A distribution of grades in an introductory statistics class (where A = 4,B = 3, etc) is:012340.11 0.17 0.22 0.31 Find the mean and variance for the grades in this class.
0.19
Question 4Your answer is CORRECT.The weights of male and female students in a class are summarized inthe following boxplots:
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Which of the following is NOT correct?
Question 5Your answer is CORRECT.Given that , find .
a) 0.129b) 0.652c) 0.871d) 0.348e) 0.571
Question 6
Your answer is CORRECT.
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