Let x be the age in years of a licensed automobiledriver. Let y be the percentage of all fatal accidents(for a given age) due to speeding. For example, the first data pairindicates that 39% of all fatal accidents of 17-year-olds are dueto speeding.
| x | 17 | 27 | 37 | 47 | 57 | 67 | 77 |
| y | 39 | 25 | 19 | 12 | 10 | 7 | 5 |
Complete parts (a) through (d), given
Σx = 329, Σy = 117,Σx2 = 18,263,Σy2 = 2825, Σxy =4029, and r ≈ −0.942.
(a) Find x, and y. Then find the equation of the least-squaresline  = a + bx. (Round your answers forx and y to two decimal places. Round your answers for aand b to three decimal places.)
(b) Find the value of the coefficient of determinationr2. What percentage of the variation iny can be explained by the corresponding variationin x and the least-squares line? What percentage isunexplained? (Round your answer for r2to three decimal places. Round your answers for the percentages toone decimal place.)
| r2 = | |
| explained    | % |
| unexplained    | % |
c) Predict the percentage of all fatal accidents due to speedingfor 35-year-olds. (Round your answer to two decimal places.)
%
(d)Use a calculator to verify that
x = 63,
x2 = 1079,
y = 640,
y2 = 91,738,
and
xy = 9,677.
Compute r. (Round your answer to three decimalplaces.)
PLEASE WRITE THE ANSWER CLEAR
