Homework Help: stat

Posted by veedu on Monday, June 18, 2012 at 12:20pm.

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, Monday, June 18, 2012 at 5:34pm
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.

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