Chapter 1: Q T1.5. (page 79)
The percentage of students with less than $10 in their possession is closest to
(a) 30%. (b) 35%. (c) 50%. (d) 60%. (e) 70%
Short Answer
The correct option is (c)
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Chapter 1: Q T1.5. (page 79)
The percentage of students with less than $10 in their possession is closest to
(a) 30%. (b) 35%. (c) 50%. (d) 60%. (e) 70%
The correct option is (c)
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Fuel efficiency In an earlier example, we examined data on highway gas mileages of the model year midsize cars. The dot plot below shows the difference (highway – city) in EPA mileage ratings for each of the car models from the earlier example.
(a) Explain what the dot above represents.
(b) What does the graph tell us about fuel economy in the city versus on the highway for these car models? Be specific.

The histogram below shows the distribution of the percent of women aged and over who have never married in each of the states and the District of Columbia.

The leftmost bar in the histogram covers percent of never-married women ranging from about
(a)
(d)
(b)
(e) None of these.
(c)
Which of the following bar graphs is equivalent to the pie chart in Question T1.2?

Feeling sleepy? The first four students to arrive for a first-period statistics class were asked how much sleep (to the nearest hour) they got last night. Their responses were and
(a) Find the standard deviation from its definition. That is, find the deviations of each observation from the mean, square the deviations, then obtain the variance and the standard deviation.
(b) Interpret the value of you obtained in (a).
(c) Do you think it’s safe to conclude that the mean amount of sleep for all students in this class is close to hours? Why or why not?
Here, once again, is the stem plot of travel times to work for randomly selected New Yorkers. Earlier, we found that the median was
Use your calculator to find the mean travel time. Was your answer to Question correct?
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