Question 1162667
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(a)  Add 120 (supervisors) and 302 (management) and relate the sum to the total employees.



(b)  From the total employees, subtract 1460 (Production) and then relate the difference to the total employees.
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The fact that the events are mutually exclusive MEANS that these subsets are DISJOINT (have empty intersections), which is very natural.



Solved.