The owner of the Crmerie du Nord compiled the average number of hours worked by his employees. The average working time per month is 24.4 hours and the standard deviation is 2.5 hours. Assuming that the variable "number of hours worked per month" is distributed according to a normal law, answer the following questions.

Question 8 What is the probability that one of his randomly selected employees works more than 25 hours per month?

Question 9 12% of its employees work a maximum of how many hours per month? Question 10 What is the probability that a randomly selected employee works between 20 and 30 hours per month?