Hello, here is a question for Probability and Statistics. Please show the solution with full explanation. Thank you.

2. In a toy car manufacturing company, the weights of the toy cars follow a normal distribution with a mean of 15 grams and a standard deviation of 0.5 grams. a) What is the probability that a toy car randomly picked from the entire production weighs at most 14.3 grams? b) Determine the minimum weight of the heaviest 5% of all toy cars produced. c) If 28,390 of the toy cars of the entire production weigh at least 15.75 grams, how many cars have been produced