# In a local college, 20% of the math majors are women. Ten math majors are chosen at random. How do you find the mean and the variance?

Mean, $\setminus \mu = n \cdot p = 10 \cdot 0.2 = 2$
Variance, $s = n \cdot p \cdot \left(1 - p\right) = 10 \cdot 0.2 \cdot \left(1 - 0.2\right) = 1.6$