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December 18th, 2009, 08:03 PM   #1
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probabilities!

i'm a first-time poster.. need some help on this one question i need to figure out to study for a final coming up

********
at a high school prom, the probability of exactly 15 out of 70 students that will wear all-white attire (tuxedos, gowns, etc.) is about 0.2698. What is the probability of a randomly selected student that is wearing all-white attire?
********

so for this question, do I use the formula: P= nCx (P^x) (q^n-x) ?

If yes, will the data i need to plug into it be:

n = 70
x = 15
p = 0.2698
q = 0.7302

?

i'm asking this because the last part threw me off a bit - the probability of a randomly
selected student wearing all-white attire. what do I have to do to change my data points
if I'm wrong? would n = 15 and x = 1 ???
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December 18th, 2009, 10:03 PM   #2
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Re: probabilities!



but I don't see any real solution. The maximum value of the left-hand side is 0.11552573 for p = 0.2142857.
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December 19th, 2009, 03:57 AM   #3
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Re: probabilities!

Hi all;

I am having the same problem :



Has a maximum at 3 / 14 of .1155257 so their is no way any p can ever equal .2698. Are the numbers correct?
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