The Average Lengths L of Cellular Phone Calls in Minutes

question 35

Multiple Choice

The average lengths L of cellular phone calls in minutes from 1999 to 2004 are shown in the table below.
$\begin{array}{l}\begin{array}{|l}\hline \\\text { Year }\\\hline 1999 \\2000 \\2001 \\2002 \\2003 \\2004\\\hline \end{array}\begin{array}{|c|}\hline \text { Average length, L } \\\text { (In minutes) }\\\hline 2.38 \\2.56 \\2.74 \\2.73 \\2.87 \\3.05\\\hline \end{array}\end{array}$

Use the regression feature of a graphing utility to find a linear model for the data. Let $t$ represent the year, with $t = 9$ corresponding to 1999 . Use the model to predict the average lengths of cellular phone calls for the year 2015 . Round your answer to two decimal places.

• A) \(4.37\) minutes
• B) \(8.74\) minutes
• C) \(5.37\) minutes
• D) \(3.37\) minutes
• E) \(2.19\) minutes

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