Question

According to the theory of genetics a certain cross of guinea pigs will result in red, black and white off-springs in the ratio of 8:4:4. Find the probability that among 6 such off-springs 4 will be red, 1 black and 1 white.

x=red
y=black
z=white

f(x=4,y=1,z=1; 1/2,1/4,1/4, 6)
= (6!/4!)(1/2)^4(1/4)(1/4)
≈ 0.1172


am I right or way off?

Answer 1

looks good !

Answer 2

thanks!