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Suppose the linear regression line y=2.4x+3.1 predicts the time, in minutes, it takes you to be served at a food stand if there are x people in line ahead of you. About how much time would it take you to be served if there are 4 people in line ahead of you?

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Explanation

From the statement, we know that:

• y = time (in minutes) it takes you to be served at a food stand,

,

• x = people in line ahead of you,

The value of y is determined by:

[tex]y=2.4x+3.1.[/tex]

For x = 4 people, the time (in minutes) is:

[tex]y=2.4\cdot4+3.1=12.7.[/tex]Answer

12.7 minutes

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