The weight distribution of greyhound dogs follows a Normal Distribution with a Mean of 120 lbs and a Standard Deviation of 20 .Based on the empirical rule for a normal distribution.

1. For population of greyhounds, what is the probability that a randomly selected dog will weigh between 100 lbs and 140lbs?

2. for population of greyhounds, what is the Probability that a randomly selected dog will way 140lbs or more?

3. For population of greyhounds what is the probability that a randomly selected dog will weigh 160 or less?

4. If a population of greyhound dogs consist of 1000 canines how many dogs would you expect to weigh between 80lbs and 160lbs?