Question

xhcjdjskxkjdndfjjfjffjjfjfjfnf

Answer 1

To find the variance, we have to use the following formula

$\sigma^2=np(1-p)$

Where n = 122 and p = 0.64, let's use these values

$\begin{gathered} \sigma^2=122\cdot0.64(1-0.64)=78.08(0.36) \\ \sigma^2\approx28.1 \end{gathered}$

Hence, the variance is 28.1.