A set of 50 data values has a mean of 31 and a variance of 25. I. Find the standard score (z) for a data value = 35. II. Find the probability of a data value > 35. Solution I\'m assuming it\'s a normal distribution? If so, then you need to use the standard normal table for the second part. to find the z-score, the formula is (X-mew)/(SD/sqrt(n)) mew=31, SD=625, n=50, X=35.