The monthly utility bills in a city are normally distributed with a mean of $100 and a standard deviation of $12.  A utility bill is randomly selected.

1. Find the probability to three significant figures that the utility bill is less than $70.  {#1}
   
2. Find the probability to three significant figures that the utility bill is between $90 and $120.  {#2}
   
   
3. Find the probability to three significant figures that the utility bill is more than $140.  {#3}