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The following values represent the number of smartphones sold per day at a local cell phone retail store during the last 10 business days. 15

The following values represent the number of smartphones sold per day at a local cell phone retail store during the last 10 business days. 15 5 7 14 18 11 12 16 8 17 a) Calculate the range. b) Calculate the variance. c) Calculate the standard deviation.

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