Question 3 (Total of 19 marks) Problems with a telephone line that prevent a customer from receiving or making calls are disconcerting to both the...

Question 3 (Total of 19 marks)

Problems with a telephone line that prevent a customer from receiving or making calls are disconcerting to both the customer and the telephone company. These problems can be of two types: those that are located inside a central office and those located on lines between the central office and the customer's equipment. The following data represent samples of 20 problems reported to two different offices of a telephone company and the time to clear those problems (in minutes).