## Algebra 1: Common Core (15th Edition)

The probability is: P(4 calls) = $\frac{17}{20}.\frac{17}{20}\frac{17}{20}.\frac{17}{20}=\frac{83521}{160000}\approx 52.2 %$
The events are independents because calling one person does not affect the probability of the other person not taking the survey. So, write the percent as a fraction which will be the probability: $85 %$ =$\frac{85}{100}= \frac{17}{20}$ The probability is: P(4 calls) = $\frac{17}{20}.\frac{17}{20}\frac{17}{20}.\frac{17}{20}=\frac{83521}{160000}\approx 52.2 %$