# QNT 275 Week 2 Practice Set

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QNT 275 Week 2 Practice Set

Chapter 03, Section 3.1, Problem 009

Correct.

The following data set belongs to a population:

4−220−1015127

Calculate the mean, median, and mode.

Mean =

Median =

Mode =

Chapter 03, Section 3.2, Problem 033

Correct.

The following data give the prices of seven textbooks randomly selected from a university bookstore.

\$85 \$173      \$105      \$122      \$51 \$156      \$141

Find the mean for these data. Calculate the deviations of the data values from the mean. Is the sum of these deviations zero?

Mean = \$

Deviation from the mean for \$173 = \$

Sum of these deviations = \$

Calculate the range, variance, and standard deviation. [Round your answers to 2 decimal places.]

Range = \$

Variance =

Standard deviation = \$

Chapter 03, Section 3.4, Problem 063

The one-way commuting times from home to work for all employees working at a large company have a bell-shaped curve with a mean of 32 minutes and a standard deviation of 9 minutes. Using the empirical rule, find the approximate percentages of the employees at this company who have one-way commuting times in the following intervals.

5 to 59 minutes

%

23 to 41 minutes

%

14 to 50 minutes

%

Chapter 03, Section 3.5, Problem 069a

Correct.

The following data give the speeds of 13 cars, measured by radar, traveling on I-84.

73   75   69   68   78   69   74

77   72   83   63   77   71

Find the values of the three quartiles and the interquartile range.

Q1=

Q2=

Q3=

IQR= 8

Chapter 03, Section 3.6, Problem 077