## Precalculus (6th Edition) Blitzer

The probability that a randomly picked American has not done 4 years (or more) of college is $\frac{43}{58}$.
We know that the probability that a randomly picked American has not done 4 years (or more) of college is as given below: $P\left( \text{not completed 4 years or more of college} \right)+\left( \text{completed 4 years} \right)=1$ \begin{align} & P\left( \text{completed 4 years} \right)=\frac{(\text{Numbers of students completed 4 years)}}{(\text{Total numbers of students)}} \\ & =\frac{43}{174} \end{align} \begin{align} & P\left( \text{not completed 4 years or more of college} \right)=1-P\left( \text{completed 4 years} \right) \\ & =1-\frac{\text{45}}{\text{174}} \\ & =\frac{43}{58} \end{align} Thus, the probability that a randomly picked American has not done 4 years (or more) of college is $\frac{43}{58}$.