Please explain information for excel, unable to calculate info in excel solutions

Suppose that New York State high school average scores, for students who graduate, are normally distributed with a population mean of 70 and a population standard deviation of 13.

a) The "middle" 95% of all NYS high school students have average scores betweenand?

b) What proportion of NYS high school students have average scores between 60 and 75?

c) Calculate the 14thpercentile.

d) Calculate the 92ndpercentile.

a) 95% of all NYS HS Students have average scores between 44.52 and 95.48

b) 42.74% of NYS HS Students have average scores between 60 and 75.

c) Z= - 1.08 = (X - 70) / 13

X= 55.96

d) X= 88.33