A study of long-distance phone calls made from General Electric Corporate Headquarters in Fairfield, Connecticut, revealed the length of the calls, in minute, follows the normal probability distribution. The mean length of time per call was 4.2 and the standard deviation was 0.60 minute.

1. what is the probability that calls last between 5 and 6 minutes? (Round your answer to 4 decimal places.)
2. what is the probability that calls last between 4 and 6 minutes? (Round z~score computation to 2 decimal places and your final answer to 4 decimal places)