Question

Suppose you are working with a data set in which the mean = 100, and the standard deviation = 20.

4 2 0 2 3

1. What is the z-score for Jeff, who has a raw score of 85?   
2. What is the z-score for Ashley, who has a raw score of 125?
3. What is the raw score for Vale, who has a z-score of -1.00?
4. What is the raw score for Michael, who has a z-score of 2.00?
5. What proportion of scores lie above Jeff’s score?   
6. What percentage of scores lie above Ashley’s score?
7. What proportion of scores lie below Vale’s scores?   
8. What percentage of scores lie below Michael’s score?   
9. What proportion of scores lie between the mean and Jeff’s score?
10. What proportion of scores lie between the mean and Vale’s score?   
11. What proportion of scores lie between Vale and Michael’s scores?        
12. What proportion of scores lie between Ashley and Vale’s scores?
13. What z score represents the 75^th percentile?
14. What z score represents the 25^th percentile?   
15. What raw score represents the 75^th percentile?   
16. What raw score represents the 25^th percentile?   

17.What raw score represents the 50^th percentile?   

Answer 1

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