The time per week a student uses a lab computer is normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hour.  A student is randomly selected.

1. Find the probability to three significant figures that the student uses a lab computer less than 4 hours per week.  {#1}
   
2. Find the probability to three significant figures that the student uses a lab computer between 5 and 7 hours per week.  {#2}
   
   
3. Find the probability to three significant figures that the student uses a lab computer more than 8 hours a week.  {#3}