Struggling with how to start this question:
A factory processes chickens with masses between 1.5 and 2.5kg. "Natural" chickens have masses equally spread across this range. However, "GM" chickens have masses between 2.3 and 2.4kg.
If a factory produces 10 million chickens per year, how many GM chickens would be required to produce a 5-sigma anomaly in the chicken mass spectrum?
I understand that the chicken masses are going to follow a normal distribution but quite lost after that. Anybody want to shed some light?