Algebra
posted by DC .
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 175 and a standard deviation of 6. We find the heights of 80 people.
(a) How many would you expect to be between 167 and 183 cm tall?
(b) How many would you expect to be taller than 170 cm?

my trusty normal distribution calculator tells me that
prob (between 167 and 183) = .8176
prob( > 170) = .7977
multiply each of those by 80
http://davidmlane.com/normal.html 
Thank you so much for your response. Just to be clear are you saying I need to multiply .8176 x 80 and then .7977 x 80?