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January 27, 2015

January 27, 2015

Posted by **miriam** on Thursday, March 31, 2011 at 12:40am.

- statistics -
**MathGuru**, Thursday, March 31, 2011 at 11:21amFind mean and standard deviation. Use z-scores to find z, then a z-table to find your probability based on the z-score. This is a normal approximation to the binomial distribution.

I'll get you started:

mean = np = (500)(.56) = ?

standard deviation = √npq = √(500)(.56)(.44) = ?

Note: q = 1 - p

Finish the calculations.

To find z-score:

z = (x - mean)/sd

Note: x = 250

Once you have the z-score, look in a z-table using the score to find your probability. Remember that the question is asking "at least 250" when looking at the table.

- statistics -
**Anonymous**, Wednesday, April 11, 2012 at 4:33pm.243

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