Suppose you pay back $470 on a $450 loan you had for 105 days. What was your simple annual interest rate? State your result to the nearest hundredth of a percent.

Option: A is the correct answer.

              A.  -0.903

The formula to calculate correlation coefficient r is given by:

        x          y         xy          x²            y²        

        4         23        92        16           529

        5          12        60        25          144

        8          10        80        64          100

        9          9          81         81            81

        13         2          26       169           4

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∑     39       56        339      355         858

Also n=5 ( as there are 5 data points )

Hence, we get:

     Hence,  the r-value of the following data, to three decimal places is:

                               A.  -0.932