Binomial Probability distribution

Question

When dragons on planet Dathomir lay eggs, the eggs are either green or yellow. Biologists have observed over the years that 27% of the eggs are yellow, and the rest green. Next spring, the lead scientist has permission to randomly select 63 of the dragon eggs to incubate. Consider all the possible samples of 63 dragon eggs.

What is the mean (μμ) number of yellow eggs in samples of 63 eggs? 

μμ =

What is the standard deviation (σσ) in the number of yellow eggs in samples of size 63?

Answer 1

mean is np = 63*0.27 = 17.01

standard deviation = sqrt(npq) = sqrt(63*0.27*0.73) = 3.52