Calculate the mean and standard deviation of the discrete probability distribution (round to 2 decimal places when necessary): $0 to less $5,000 to $10,000 to $15,000 to $20,000 to than less than less than less than $5,000 $10,000 $20,000 $25,000 Hint: Use the midpoints for each interval ofx-values. Mean: Standard Deviation: A regression analysis done in Excel reveals a linear regression equation of j? = 17.95 08653:, with explained variation of SSR = 1, 974 and unexplained variation of SSE = 976. a. Determine the coefficient of determination (r2) , rounded to 3 decimal places. 0 r2 = 0.331 O r2 = 0.494 O r2 = 0.669 O r2 = 0.748 O r2 = 0.865 b. Determine the coefficient of correlation (r), rounded to 3 decimal places. Or = 0.818 Or = 0.703 Or = 0.448 Or= -0.575 Or= -0.818\fO a O b O C od O e