Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

تمرين 129

Hatchery Fish. Length A large tank of fish from a hatchery is the being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random simple of 36 fish is taken from the tank. Let
be the mean sample length of these fish. What is the probability that
is within 0.5 inch of the claimed population mean