The lengths of the trout fry in a pond at the fish hatchery are approximately normally distributed with mean 3.4 inches and standard deviation .8 inch. Three dozen fry are netted and their lengths measured.
(a) What is the probability that the sample mean length of the 36 netted trout fry is less than 3.2 inches?
(b) Why might the fish in the net not represent a random sample of trout fry in the pond?