What is the mean for these data

What is the mean for these data. The following data give the prices of seven textbooks randomly selected from a university bookstore. $87 $170 $109 $115 $51 $163 $145 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 $170 = $ Sum of these deviations = $ b. Calculate the range, variance, and standard deviation. [Round your answers to 2 decimal places.] Range = $ Variance = Standard deviation = $

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