the question reads: "Considering current conditions, and 30 years of sample observations, the region should receive ___ inches of rainfall in 14 out of 25 years. Given values include mean of 39.95 inches and SD of 7.5 inches." no other data is given.
I am cursed with a horrible textbook.
In regards to a normal distribution:
when given a mean and standard deviation, I can compute a probability of precipitation in inches with no problem.
IE: when asked what is the probability that rainfall in a given area will exceed a given # of...