Assume there is the perfect negative correlation between amount of time spent (on average) answering each and every question on a test and total score upon the test. Suppose 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?