The table below brings the time spent (in minutes) on the graded practice exam 1 and the scores of 10 randomly selected ECN 221 online students. time spent (in mins) 36 28 9 15 8 17 39 22 34 10 Grade (out of 10) 4.3 9.6 6.1 6.0 6.2 9.6 6.1 5.9 4.1 8.6 Calculate the Z-score for grades when the grade is equal to 8.8. Use s.d. = 1.86 Round up to four decimal places for your final answer. Include the zero and the MINUS before the decimal place when needed. E.g., -0.1234 No credit will be given for rounding mistakes.