Cancer

Of the 80 people 50 people ill cancer. What percentage of people isn't ill?

Correct answer:

p =  37.5 %

Step-by-step explanation:

$$\begin{gathered} r=fr(50,80)={\displaystyle \frac{5}{8}}=0.625 \\ p=100\cdot (1-r)=100\cdot (1-0.625)=37.5\mathrm{\%} \end{gathered}$$

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