Standard deviation and proportion

I have never taken a single stat class and I'm almost done reading a textbook on Probability and Statistics. So I decided to help tutor STAT at work, but umm.... It turns out that understanding probability/stat theorems with calculus proof doesn't necessary means that I can also do the basic stat... Please help me help the students...

Question:

The distribution of the body temperatures of adults is roughly bell-shaped, with a mean of 98.6 degrees Fahrenheit and a standard deviation of 0.8 degrees Fahrenheit.

What is the proportion of adults whose body temperature is above 98.6 degrees?

What is the proportion of adults whose body temperature is between 97 degrees and 100.2 degrees?

So I understand how to find standard deviation, that is the square root of the different of the expected value and the mean, but how do I go about this? Thanks.