Weights of a certain species of snails are normally distributed with a mean, =80gand a standard deviation ,= 20g.

Draw diagrams to help you solve the following problems.

1. What is the probability that a snail weighs more than 99g?(4 dp)
2. What proportion of snails will weigh between 65g and 99g?(4 dp)
3. If you had 200 snails of this species, how many of them would you expect to weigh between 65g and 99g?(round to nearest integer