**Oh please help me with this!**

Statistics from Cornell's Northeast Regional Climate Center indicates that Ithica, NY, gets an average of 35.4" of rain each year, with a standard deviation of 4.2". Assume that a Normal model applies.

A). During what percentage of years does Ithica get more than 40" of rain?

B). Less than how much rain falls in the driest 20% of all years?

C). A Cornell University student is in Ithica for 4 years. Let y "bar" represent the mean amount of rain for those 4 years. Describe the sampling distribution model of this sample mean, y "bar".

D). What's the probability that those 4 years average less than 30" of rain?