The equation $$ \hat{y}=1.2676 x+79.6645 $$ models Fred's systolic blood pressure, in mm/HG, over his life span, where $$ x $$ is Fred's age. According to the regression equation, what is the approximate systolic blood pressure of Fred at the age of 55 ? about $$ 135 \mathrm{~mm} / \mathrm{HG} $$ about $$ 149 \mathrm{~mm} / \mathrm{HG} $$ about $$ 159 \mathrm{~mm} / \mathrm{HG} $$ about $$ 165 \mathrm{~mm} / \mathrm{HG} $$

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To determine Fred's systolic blood pressure at the age of 55 using the regression equation:

$$
\hat{y} = 1.2676x + 79.6645
$$

where $$ x = 55 $$:

1. **Calculate the contribution from age:**
   $$
   1.2676 \times 55 = 69.718
   $$

2. **Add the intercept:**
   $$
   69.718 + 79.6645 = 149.3825
   $$

Rounding this value, Fred's approximate systolic blood pressure at age 55 is **149 mm/HG**.

**Answer:** about $$ 149 \mathrm{~mm} / \mathrm{HG} $$
Fred's systolic blood pressure at age 55 is approximately 149 mm/HG.

The equation models Fred’s systolic blood pressure, in mm/HG, over his life span, where is Fred’s
age.
According to the regression equation, what is the approximate systolic blood pressure of Fred at the age of 55 ?
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The equation models Fred’s systolic blood pressure, in mm/HG, over his life span, where is Fred’s age. According to the regression equation, what is the approximate systolic blood pressure of Fred at the age of 55 ? about about about about