Question: The following data reported by a manufacturing company show, for a sample of twelve months, selected from monthly data kept over a period of several years, the monthly demand for a product and the work-hours expended in the production of the item for the given month.

1 142 70

2 79 40

3 118 60

4 180 90

5 60 30

6 158 80

7 145 70

8 95 50

9 140 70

10 84 40

11 185 95

12 75 45

a. Find the “b” and “a”.

b. What is the final equation of the line?