Comparison of exam scores based on their Z scores.
1. For a sample with the standard deviation of 10, a score of X = 44 corresponds to a z-score of 0.50. Based on this info, what is the sample mean?
2. Which of the following exam scores must lead to the better grade? Describe the answer.
A. A score of X = 55 on an exam that has a mean of 60 and a standard deviation of 5.
B. A score of X = 40 on an exam that has a mean of 50 and a standard deviation of 20.