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February 1, 2015

February 1, 2015

Posted by **Randy** on Sunday, September 26, 2010 at 6:53pm.

- statistics -
**MathGuru**, Monday, September 27, 2010 at 4:49pmYour values are the following:

p = .45, q = 1 - p = .55, x = 45, and n = 110

Use the normal approximation to the binomial distribution.

Find mean and standard deviation.

mean = np = (100)(.45) = ?

sd = √npq = √(100)(.45)(.55) = ?

Once you determine the mean and standard deviation, use z-scores and z-table to find probability:

z = (x - mean)/sd

Substitute the values into the formula. Once you have the z-score, determine your probability using a z-table.

I hope this will help get you started.

- statistics -
**MathGuru**, Monday, September 27, 2010 at 4:52pmCorrection:

Use 110 for n.

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