Let the graph of g be a vertical stretch by a factor of 2 followed by a translation 3 units down of the grpah of f(x) =x2. write a rule for g (x) please help no links!!!

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?