a sample of men's heights was taken. The average height was 68.5 inches, the SD was 1.95 inches. Use the normal curve to estimate the percentage of men with heights between 69 inches and 70 inches.

Answer 1

I use this fantastic webpage for these kind of questions

http://davidmlane.com/hyperstat/z_table.html

enter the mean and SD, click on "between" and enter 69 and 70 to get

.1779