The following table shows retail sales in drug stores in billions of dollars in the U.S....

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Question

The following table shows retail sales in drug stores in billions of dollars in the U.S....

The following table shows retail sales in drug stores in billions of dollars in the U.S. for years since 1995.

Year	Retail Sales
0	85.851
3	108.426
6	141.781
9	169.256
12	202.297
15	222.266

Let S(t) be the retails sales in billions of dollars in t years since 1995. A linear model for the data is F(t)=9.44t+84.182

Estimate the retails sales in the U. S. in 2013. billions of dollars.

Use the model to predict the year that corresponds to retails sales of $244 billion=

math Statistics-And-Probability

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Answer 1

Answer #1

1)

from above model:

predicted retail sales for year 2013 (t =18) =9.44*18+84.182=254.102 billions of dollars

2)

from above : 244 =9.44t+84.182

t=(244-84.182)/9.44=16.93~ 17

therefore corresponding year =1995+17 =2012

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Answer 2

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