A normal distribution has mean .u = 60 and standard deviation 0'= 20. Find and interpret the z-score for x= 9D. -:_:- z = 2.25: a value of 90 is 2.25 standard deviations above the mean. 6) z = -1.50: a value of 9D is 1.50 standard deviations below the mean. -:_:- z = 10: a value of 90 is 10 standard deviations below the mean. -:_:- z = 1.50: a value of 90 is 1.50 standard deviations above the mean