Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 80 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.)

Question

(a) How many would you expect to be between 170 and 180 cm tall?
people

(b) How many would you expect to be taller than 178 cm?
people

Answer 1

The use of this page is more efficient and more accurate than using a standard normal distribution table,
http://davidmlane.com/hyperstat/z_table.html

for the prob(between 170 and 180) is gives .4772
for the prob( > 178) it gives .0548

multiply each of these by the 80 people and round off to the nearest whole number ( can't have partial people)

Verify my answers by you entering the data.

Answer 2

0.56