Start by defining your random variable: Let X be the random variablenumber of chicks that survive hatching.

Define the distribution followed by X: X ~ Binomial(n = ?, p = 0.65).

Write a probability statement that encapsulates the question: Find the minimum value of n such that .

Using trial and error (or, even better, technology) it doesn't take long to get n = 11. I don't see why the normal approximation would be required here.