1) For a normal curve, if the mean is 20 minutes and the standard deviation is 5 minutes, find the area to the right of 12 minutes.

2) The time it takes a technician to fix a computer problem is exponentially distributed with a mean of 15 minutes. What is the probability that it will take a technician less than 10 minutes to fix a computer problem?

3) Grades for a statistics exam for a certain class follow the normal probability distribution with a mean of 82 and a standard deviation of 12. What percentage of the students in the class had a grade 81 or more?