FIU students' weight follows a normal distribution with a mean

=

100 lbs, a variance

= 100 lbs

, and a standard deviation =10 lbs.

Such a distribution is often indicated by the symbols

N(mean, variance)

=N(100, 100).

1.

What's the probability that a random selected student's weight

will be less than 90 lbs?

2.

What's the probability that a random selected student's weight will be between 90 lbs and 110 lbs?

3. What is the 80th percentile of FIU student weight?