The Chapin Social Insight Test evaluates how accurately the subject appraises other people. In the reference population used to develop the test, scores are approximately normally distributed with mean 25 and standard deviation 5. The range of possible scores is 0 to 41.
1. If a randomly selected student has a score of 40, then how many standard deviations away from the mean is that student's score?
2. Determine the standardized value for the score of 22.
3. What is the relative frequency corresponding to a score of 25 or more?