A certain brand of yogurt is packed in tubs with masses that are normally distributed with mean of 1kg and a standard deviation of 50g. (a) Find the probability that a randomly selected tub weighs i....

Extracted text: A certain brand of yogurt is packed in tubs with masses that are normally distributed with mean of 1kg and a standard deviation of 50g. (a) Find the probability that a randomly selected tub weighs i. More than 950g, ii. Between 950g and 1100g. (b) A box contains 20 such tubs. What is the probability that the mean mass for a tub is between 980g and 1030g?