Mean and SD

Question

When a large number of a particular seed is planted, it is known that 70% of the seeds will germinate. In addition, the germination of one seed is independent of the germination of any other seed. If 20 of the seeds are planted, what are the mean and SD of the seeds that germinate?

Answer 1

This is a binomial probability problem with a P(Success)= 0.7.

 

Mean = n p = 0.7* 20 = 14

SD = Sqrt(np(1-p)) = sqrt( 20*0.7*0.3) =2.049