The following data give the prices of seven textbooks randomly selected from a university bookstore. $95 $174 $104 $116 $54 $164 $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 = $ 122 Deviation from the mean for $174 = $ Sum of these deviations = $ 52 b. Calculate the range, variance, and standard deviation. [Round your answers to 2 decimal places.] Range=$i Variance = i Standard deviation = $ i