Describe the sampling distribution model of this sample mean

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Rainfall. Statistics from Cornell's Northeast Regional Climate Center indicate that Ithaca, NY, gets an average of of rain each year, with a standard deviation of 42". Assume that a Normal model applies.

a) During what percentage of years does Ithaca get more than of rain?

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

c) A Cornell University student is in Ithaca for 4 years. Let represent the mean amount of rain for those 4 years. Describe the sampling distribution model of this sample mean,

d) What's the probability that those 4 years average less than of rain?

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