A bakery opens every day from Monday to Saturday, but only inthe morning
on Wednesdays. It is known that the number of bread rolls solddaily follows
a Gaussian distribution with mean 130 and standard deviation 20with the
exception of Wednesdays for which the distribution of the number ofbread
rolls sold is still Gaussian but with mean 100 and standarddeviation 30.
(a) What is the probability that on a Wednesday the bakery willsell more
than 140 bread rolls?
(b) What is the probability that on a random opening day the bakerywill
sell more than 140 bread rolls?
(c) What is the probability that in a week the bakery will sellmore than
800 bread rolls?
