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September 17, 2014

September 17, 2014

Posted by **Anonymous** on Monday, December 10, 2012 at 5:33pm.

- statistics -
**MathGuru**, Monday, December 10, 2012 at 8:13pmUse the normal approximation to the binomial distribution.

mean = np

sd = √npq (where q = 1-p)

Therefore:

mean = 100 * .15 = 15

sd = √npq = √(100 * .15 * .85) = 3.57

Use z-scores:

z = (13 - 15)/3.57 = -0.56

z = (17 - 15)/3.57 = 0.56

Use a z-table to find the probability between the two z-scores.

For the second part, use a 90% confidence interval formula.

I hope this will help get you started.

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