A personnel manager of a manufacturing company has cross-classified the 200 employees of his company according to their record of absenteeism last year and whether they were working day or night shift, as shown in the following table:

Number of days absent	Day A	Night A'	Total
Less than 10 B	22	110	132
10 or more B'	28	40	68
Total	50	150	200

Let

Event A = Working Day shift

Event B = Less than 10

Multiple Choice Questions:

6. What is P (A')?	A 0.55	B 0.75	C 0.73	D 0.64
7.What is P (A B)?	A 0.44	B 0.11	C 0.17	D 0.25
8.What is P (B | A)?	A 0.44	B 0.17	C 0.25	D 0.11
9.What is P (A or B)?	A 0.91	B 0.66	C 0.80	D 0.25