7/26/2019
Print Test
1/9
PRINTABLE VERSION
Final
You scored 50 out of 50
Question 1Your answer is CORRECT.Suppose that in a large metropolitan area, 77% of all households have cable tv. Suppose you are interested inselecting a group of six households from this area. Let X be the number of households in a group of sixhouseholds from this area that have cable tv. For what proportion of groups will at most three of thehouseholds have cable tv?
a) 0.279b) 0.418c) 0.582d) 0.139e) 0.861
Question 2Your answer is CORRECT.A potato chip company calculated that there is a mean of 73.1 broken potato chips in each production runwith a standard deviation of 5.2. If the distribution is approximately normal, find the probability that therewill be fewer than 66 broken chips in a run.
Question 3Your answer is CORRECT.A distribution of grades in an introductory statistics class (where A = 4, B = 3, etc) is:
4

7/26/2019Print Test2/90.1 0.18 0.2 0.31 Find the mean and variance for the grades in this class.
0.21
Question 4Your answer is CORRECT.The weights of male and female students in a class are summarized in the following boxplots:Which of the following is NOT correct?
a) The median weight of the male students is about 166 lbs.b) About 50% of the male students have weights between 150 and 185 lbs.c) The mean weight of the female students is about 120 because of symmetry.d) The male students have less variability than the female students.
Question 5Your answer is CORRECT.Given that , find
.

7/26/2019
Print Test
3/9