The Average Lengths L of Cellular Phone Calls in Minutes

question 143

Multiple Choice

The average lengths L of cellular phone calls in minutes from 1999 to 2004 are shown in the table below. 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 2006. Round your answer to two decimal places.

• A)6.54 minutes
• B)1.64 minutes
• C)2.27 minutes
• D)4.27 minutes
• E)3.27 minutes

---

Definitions:

Allocate

The process of distributing resources or goods among various uses or individuals based on specific criteria, such as need or merit.

Marginal Change

A small incremental adjustment to a plan of action.

Incremental Adjustment

Small, gradual changes or modifications made in response to changing conditions or to improve a process or system.

Scarcity

A fundamental economic problem of having seemingly limitless human wants in a world of limited resources, leading to the necessity of making trade-offs.