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