Question

The heights of a certain group of adult males was found to be normally distributed. The mean height is 170 cm with a standard deviation of 6 cm. In a group of 1200 of these males, about how many would be more than 164 cm tall?

Answer 1

X ~ N(170, 6)
Find P(X > 164) = p. Then you have a Binomial Y ~ Bin (1200 , p)

Answer 2

Find E(Y)

Answer 3

how do you find E(Y)?

Answer 4

E(Y) = 1200p

Answer 5

I dont get it... Can you give me an example like this and solve it? :\