Question

in a sample study of 642 people it was found that 514 people have a high school certificate if a person is selected at random the probability that the person has a high school certificate is​

Answer 1

$p(e) = \frac{no \: of \: favourable \: outcomes}{total \: no \: of \: outcomes} \\ p(e) = \frac{514}{642} \\ = \frac{257}{321}$

*please check if it solves further but I think this would be the answer *

Answer 2

Total number of persons = 642

Number of persons with high school certificate = 514

therefore Required probability=514 / 642 =0.80