The following data give the prices of seven textbooks randomly selected from a university bookstore. $8 8 $176 $10 4 $114 $5 3 $158 $147 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 $176 = $ Sum of these deviations = $ b. Calculate the range, variance, and standard deviation. [Round your answers to 2 decimal places.] Range = $ Variance = Standard deviation = $