Please answer the following questions.

1. For a population with =40 and =11, find the z-score for the following X values.

X=45 X=25

2. For a population with =60 and =12, find the X-score that corresponds to each of the following z-scores.

z=0.5 z=-2.5

3. For a sample with a standard deviation of s=8, a score of X=65 corresponds to z=1.50. What is the sample mean?

4. A score that is 9 points above the mean corresponds to a z-score of 1.5. What is the population standard deviation?