Mary and her father went on an all day ride in the car they traveled 3 times In the afternoon as he did in the morning at the end of the day they had traveled for 420 miles how far did they travel in the morning

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