he table shows Kelly's hours of exercise and weight loss each week.

Hours of exerciseWeight loss (pounds)1.30.532.853.522.543

(a) Use a linear regression model to estimate how many hoursKelly will have to exercise a week in order to lose 4.2 pounds. Round answer to one decimal place. Do not write the units.

hours

(b) According to the coefficient of determination,%of the variation of weight loss is unexplained and is due to other factors. Round answer to one decimal place. Do not write the % sign.

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