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Stat 145: Exam 1 Review Questions
Note:
This is not intended to be a preview of the actual exam. Rather, it is meant to give
you an idea of the types of questions that will be asked. There are concepts in these review
problems that will not appear on the actual exam, just as there will be concepts on the actual
exam that are not covered in these review problems.
1. In an introductory statistics class with 136 students, the professor recorded how much
money each student had in their possession during the ﬁrst class of the semester. The
histogram below shows the data collected:
(a) Approximately how many students had less than $20 in their possession?
(b) Describe the shape, center, and spread of this distribution.
(c) If the outlier on the right side of the histogram is removed, will the standard
deviation increase, decrease, or stay the same? Explain.
2. Bottles of a popular cola contain, on average, 300 milliliters (ml) of cola. The standard
deviation is 3 ml. Assume that the distribution of the contents of the bottles is
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 Summer '07
 AllStats145
 Statistics

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