Let's begin by listing out the information given to us:
Male = 30%
Female = 70%
Sample = 30
A stratified sample is one that ensures that the subgroup of a population is represented in equal measure in the sample
The sample will contain this number of males: 30% * 30
[tex]\begin{gathered} \frac{30}{100}\cdot30=\frac{900}{100}=9 \\ =9males \end{gathered}[/tex]