Hilo, Hawai‘i receives an average of approximately 135 in of rainfall every year.  If the annual rainfall's standard deviation is 30 in, then find each of the following:

1. Fifty percent of the time it rains at least how many inches?
   
   
   
2. Seventy-five percent of the time it rains no more than how many inches?
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
3. Only once every ten years the annual rainfall should exceed how many inches?