Posted by Kayla on Sunday, February 10, 2013 at 4:28pm.
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.

Statistics  MathGuru, Sunday, February 10, 2013 at 5:45pm
Mean = np
Standard deviation = √npq
Note: q = 1  p
n = 100
p = 0.5
q = 0.5
Once you find the mean and standard deviation, use zscores:
z = (x  mean)/sd
(x = 55)
Check a ztable to find the probability using the zscore you calculated.

Statistics  Jane, Sunday, February 10, 2013 at 6:35pm
54.550/50 = 4.5/5 = 0.9 z= 0.1841
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