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# MAT201

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1. To get the best deal on a CD player, Tom called eight appliance stores and asked the cost of a specific model. The prices he was quoted are listed below:

\$ 298 \$ 125 \$ 411 \$ 157 \$ 231 \$ 213 \$ 304 \$ 272 Find the Standard deviation

2. When investigating times required for drive-through service, the following results (in seconds) were obtained. Find the range, variance, and standard deviation for each of the two samples, then compare the two sets of results.

Wendy's 120 123 153 128 124 118 154 110

McDonald's 115 126 147 156 118 110 145 137

3. A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. Find the standard deviation of the data summarized in the given frequency distribution.

Salary Number of Employees

5,001 -10,000 14

10,001 - 15,000 13

15,001 - 20,000 18

20,001 - 25,000 18

25,001 - 30,000 17

4. The heights of a group of professional basketball players are summarized in the frequency distribution below. Find the standard deviation.

Height (in.) Frequency

70-71 3

72-73 7

74-75 16

76-77 12

78-79 10

80-81 4

82-83 1

Case assignment expectations:

Your ability to describe the information provided by the Standard Deviation.
Your ability to use the Standard Deviation to calculate the percentage of occurrence of a variable either above or below a particular value.
Your ability to describe a normal distribution as evidenced by a bell shaped curve.
Your ability to prepare a distribution chart from a set of data.

#### Solution Preview

The range is the difference of the highest and lowest values in the data set (The information was obtained at http://www.mathgoodies.com/lessons/vol8/range.html).

Wendy's has a smaller range (44) than McDonald's range (46). Therefore, the Wendy's drive thru time are closer than McDonald's drive thru ...

#### Solution Summary

The expert investigates drive-through services.

\$2.49