In a simple linear regression problem, the following statistics are calculated from a sample of 10 observations:= 2250,      = 10,       = 50,       = 75The least squares estimates of the slope and y-intercept are respectively:

Select one:

a. 225 and -1117.5.b. 2.5 and -5.c. 25 and -117.5.d. 25 and 117.5.