The number off standard deviations between a score and the mean score indicated by a z-score. what was Cindy's z-score on the science test

Z score of 0 gives you the mean for the problem; The mean μ is 70 Now you can use this value of the mean in the definition of z score for the second case and find the standard deviation. Z score is the number of standard deviations away from the mean. Therefore σ = (1) (74-70) = 4.