Assume there is a perfect negative correlation between the amount of tie spent (on average) answering each question on a test and the total score on the test. Assume that Mx=30 seconds, and sx=10 seconds for the time per item, and that My=70, with S2=14 for the total score.
a. If someone spent 10 seconds per item, what total score would they receive?
b. If someone's score on the exam was 49, how many seconds did they spend per item?