# Chapter 4 - Probability - 4-3 Addition Rule - Basic Skills and Concepts: 25

a)78.6% b)14.3% c)The labels described as concentration are much better.

#### Work Step by Step

a) We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, hence probability=$\frac{11}{11+3}=0.786=78.6$%. b) We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, hence probability=$\frac{2}{12+2}=0.143=14.3$%. c) By seeing the earlier results, the labels described as concentration are much better.

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