Posted by Sonny on .
A study has shown that among people without any preschool education, 32% were employed at age 19. If 100 people without preschool education are selected, find the probability that 40 or fewer are employed.

STATISTICS 
MathGuru,
Find z.
z = (x  mean)sd
mean = np
sd = √npq
n = 100
p = .32
q = 1  p = .68
Substitute 40 for x in the formula. Calculate mean and standard deviation. Plug in the other values. Find z, then check ztable for your probability.
I hope this will help get you started.