Posted by Karen on Saturday, February 16, 2013 at 8:36pm.
An airline reports that if has been experiencing a 15% rate of noshows on advanced reservations. Among 150 advanced reservations, find the probability that there will be fewer than 20 noshows.

Statistics  MathGuru, Monday, February 18, 2013 at 9:03pm
Mean = np = 150 * .15 = ?
Standard deviation = √npq = √(150 * .15 * .85) = ?
Note: q = 1  p
I'll let you finish the calculations.
Once you have the mean and standard deviation, use zscores:
z = (x  mean)/sd
Note: x = 20
After you calculate z, check a ztable to find your probability. (Remember that the problem is asking for "fewer than 20" when you check the table.)
I hope this will help get you started.
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