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Chapter 2: Q 58. (page 140)
Blood pressure Refer to Exercise According to the same health information website, diastolic blood pressure between and indicates borderline high blood pressure. About what percent of adults have borderline high blood pressure?
Around of the adults have borderline high blood pressure.
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Comparing batting averages Three landmarks of baseball achievement are Ty Cobb鈥檚 batting average of in Ted Williams鈥檚 in and George Brett鈥檚 in These batting averages cannot be compared directly because the distribution of major league batting averages has changed over the years. The distributions are quite symmetric, except for outliers such as Cobb, Williams, and Brett. While the mean batting average has been held roughly constant by rule changes and the balance between hitting
and pitching, the standard deviation has dropped over time. Here are the facts:
Find the standardized scores for Cobb, Williams, and Brett. Who had the best performance for the decade he played?
The number of absences during the fall semester was recorded for each student in a large elementary school. The distribution of absences is displayed in the following cumulative relative frequency graph. 
What is the interquartile range (IQR) for the distribution of absences?
a. 1
b. 2
c. 3
d. 5
e. 14
The weights of laboratory cockroaches can be modeled with a Normal distribution having mean grams and standard deviation grams. The following figure is the Normal curve for this distribution of weights.
About what proportion of the cockroaches will have weights greater than 83 grams?
Run fast! As part of a student project, high school students were asked to
sprint yards and their times (in seconds) were recorded. A cumulative relative frequency graph of the sprint times is shown here. 
a. One student ran the yards in seconds. Is a sprint time of seconds unusually slow?
b. Estimate and interpret the percentile of the distribution.
Refrigerators Refer to Exercise
a. Use your calculator to make a Normal probability plot of the data. Sketch this graph on your paper.
b. What does the graph in part imply about whether the distribution of refrigerator capacity is approximately Normal? Explain.
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