10. (10 points) Let a: be the age of a licensed driver. Let y be the percentage of all fatal accidents due to failure to yield the right of way. From 8 observations, the summary of data is given: 8 8 8 8 8 29..- = 435, 2y.- =146, 29:? = 31343. 23;? = 3953, Eng.- =10333. i=1 i=1 i=1 i=1 i=1 (a) (4pts) Find the equation of the least-squares line 3'; = a + bx. Bound to four decimal places. (b) (2pts) Interpret the slope b in the context of the question. (c) (2 pts) Find the value of the sample correlation coefficient r. (d) (2pts) Find the value of the coefcient of determination r2 and interpret it in the context of the