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February 28, 2015

February 28, 2015

Posted by **Anonymous** on Monday, November 5, 2012 at 11:07am.

- statistics -
**MathGuru**, Monday, November 5, 2012 at 6:17pmUse the normal approximation to the binomial distribution.

Mean = np = 128 * .40 = 51.2

Standard deviation = √npq = √(128 * .40 * .60) = √30.72 = 5.54

Note: q = 1 - p

Formula for z-scores:

z = (x - mean)/sd

With your data:

z = (45 - 51.2)/5.54 = -1.12

Look at a z-table for the probability using the z-score.

Double check my calculations.

I hope this will help.

- statistics -
**Tyler Eldred**, Wednesday, November 19, 2014 at 6:24pmthe answer is 0.113 its confusing and i got it wrong the first time too, (same class)

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