Question: Text messages have been a major source of revenue for
Text messages have been a major source of revenue for cell phone carriers and for the first time in history the aver-age number of text messages per month decreased from the second to the third quarter of 2012. The Excel file text messages.xlsx lists the number of text messages sent last month from a sample of 70 cell phone customers. Using Excel, determine the range, variance, and standard deviation for this sample.
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