A phone company has a monthly cellular data plan where a customer pays a flat mo

Question

A phone company has a monthly cellular data plan where a customer pays a flat month fee of $10 and then a certain amount of money per megabyte (MB) of data used on the phone. If a customer uses 20 MB, the monthly cost will be $11.20. If the customer uses 130 MB, the monthly cost will be $17.80. a. Multiple choice: The linear regression model most closely fitting this data (when c represents monthly plan cost in dollars and d represents MB of data used) is: A. c = -0.06d + 10 B. c = 0.06d +10 C. c = -16.67d + 10 D. c = 16.67d + 10 b. Use the model to predict monthly plan cost if 200 MB are used (round answer to nearest cent if necessary) Show work! c. Fill in the blanks to interpret the slope of the equation: The rate of change of monthly phone plan cost with respect to data usage is per.(Include units of measurement.

Explanation / Answer

a) Correct Answer : Option B

b) The regression equation is

         c = 0.06d + 10

            = 0.06(200) + 10

            = $ 22

c) $0.06 per one MB

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