Given the contingency table shown here,what is the probability that a mother smoked during pregnancy or that she graduated from college? 
Definitions:
Marginal Revenue
The extra revenue earned by selling an additional unit of a product or service.
Demand Curve
A graphical representation of the relationship between the price of a good and the quantity demanded by consumers, typically downward-sloping.
Marginal Revenue
The additional income earned by producing and selling one more unit of a product or service.
Marginal Revenue
The additional revenue that a firm receives from selling one more unit of a good or service.
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