Question

in a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. from 10 graduates selected at random, what is the expected number of graduates will not go to college?

Answer 1

Step 1

Given;

`\begin{gathered} p=Pr\text{ success trial=}(30)/(100)=0.3 \\ q=Pr\text{ no success trial=1-q=1-0.3=0.7} \\ x=10 \end{gathered}`

Step 2

State the expected value formula

`Expected\text{ number=xq=0.7}*10=7`

Answer;

`7`