Undergraduate students at a certain college belong to one of three groups depending on the year in which they expect to graduate. Each student must choose one of twelve different majors. How many students are needed to ensure that there are two students expected to graduate in the same year who have the same major

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample