Final answer:
To find b1, divide the sum of squares of the product of x and y by the sum of squares of x.
Step-by-step explanation:
To find b1, we need to use the given information: SS(xy) = -534.1 and SS(x) = 1775.8.
We know that the formula for the coefficient b1 in a regression equation is b1 = SS(xy) / SS(x).
Substituting the values, we have b1 = -534.1 / 1775.8 = -0.3007 (to four decimal places).