Prints from two types of film C and D have developing times which can be modelled by normal variables, C with mean 16.18 s and standard deviation 0.11 s and D with mean 15.88 s and standard deviation 0.10 s.

(a) What is the probability that a type C print will take less than 16 s to develop?

(b) A type C print is developed and immediately. afterwards a type D print is developed. What is the probability that the total time is greater than 32.5 s?

(c) What is the probability of a type C print taking longer to develop than a type D print?