### Z-score of sample means

Compute a z statistic for each, assuming the population has a mean of 100 and a standard deviation of 20: Formula is z = (x - μ) / σ a. sample of 43 scores has a mean of 101: - 2.9 b. sample of 60 scores has a mean of 96: - 1.8 c. sample of 29 scores has a mean of 100: -3.55