Question

What sampling method could you use to find the percent of studnets in your grade?

Answer 1

$\frac{number \: of \: students \:with \: same \: grade}{number \: of \: all \: students \: with \: different \: grades} \times 100$
example:all students are 39
students with same grade are 16
so
$\frac{16}{39} \times 100 = 41\%$