Men's weights are normally distributed with mean 170 pounds and standard deviation 20 pounds.Find the probability that a randomly selected man has a...

1.    Men's weights are normally distributed with mean 170 pounds and standard deviation 20 pounds.

a.    Find the probability that a randomly selected man has a weight between 140 and 190.  (Show work and round the answer to 4 decimal places)

b.    What is the 80th percentile for men's weight?  (Show work and round the answer to 2 decimal places)

c.    To get the answers for part (a) and/or part (b), what technology did you use?  If an online applet was used, please list the URL.  If a calculator or Excel was used, please write out the function.