How to calculate these problems ? The following data give the prices of seven textbooks randomly selected from a university bookstore. $9 4 $171 $10 4 $114 $5 1 $163 $143 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 % b. 25 to 39 minutes % c. 18 to 46 minutes % Chapter 03, Section 3.5, Problem 069a The following data give the speeds of 13 cars, measured by radar, traveling on I-84. 73 75 70 68 78 70 76 72 82 66 76 71 74 Find the values of the three quartiles and the interquartile range. Q1= Q2= Q3= IQR=