How to calculate these problems?      The following data give the prices of seven textbooks randomly selected from a university bookstore

How to calculate these problems? 

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

a. 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 $171 = $

Sum of these deviations = $

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

Range = $

Variance = 

Standard deviation = $

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 7 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.

a. 11 to 53 minutes

99.79590756865

%

b. 25 to 39 minutes

99.79590756865

%

c. 18 to 46 minutes

99.79590756865

%

Chapter 03, Section 3.5, Problem 069a

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

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

Q1=

Q2=

Q3=

IQR=