According to genetic theory, plants of a particular species have a 25% chance of being red-flowering, independently of other plants. Find the normal approximation to the chance that among 10,000 plants of this species, more than 2400 are red-flowering.

Answer 1

estimate approximate standard deviation to be 2400/4=600

mu=2500, standard deviation 600, above 2400

My calculator says... 0.5662

http://davidmlane.com/hyperstat/z_table.html