Answer
Mean = 80
Standard Deviation = 4
Work Step by Step
i) Mean of binomial is given by np
n = 100, p =0.80
np = 0.80 x 100 = 80
ii) Standard Deviation of binomial is given by $\sqrt {npq}$
$\sqrt {npq}$
= $\sqrt {100 \times 0.80 \times 0.20}$
= 4
