Question 1. The weights of cans of soup produced by a company are normally distributed, with a mean of 150 g and a standard deviation of 5 g.
(a) What is the probability that a can of soup selected randomly from the entire production will weigh less than 143 g?
(b) Determine the minimum weight of the heaviest 5% of all cans of soup produced.
(c) f 28 390 of the cans of soup of the entire production weigh at least 157.5 g, how many cans of soup have been produced?
Answer has been given, but why?