Posted by veedu on .
if the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female.use the normal distribution to approximate the binomial distribution

stat 
MathGuru,
Mean = np = 100 * 0.5 = ?
Standard deviation = √npq = √(100 * 0.5 * 0.5) = ?
Note: q = 1  p
Finish the calculations, then use zscores.
z = (x  mean)/sd
Note: x = 55
Determine the probability using the zscore and a ztable.
I hope this will help get you started.