The weights of toddlers in Afghanistan vary according to the normal distribution with mean 7.5 pounds and standard deviation 1.25 pounds. The government classifies a toddler as having low birth weight...

The weights of toddlers in Afghanistan vary according to the normal distribution with mean 7.5 pounds and standard deviation 1.25 pounds. The government classifies a toddler as having low birth weight if the weight is less than 5.5 pounds.

a) What is the probablity that a toddler choosen at random weighs less than 5.5 pounds at birth.

b) You choosen three toddlers at random. What is the probability that their average birth weight is less than 5.5 pounds?