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December 18th, 2009, 07:03 PM   #1
Joined: Dec 2009

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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 ???
deadeyedick is offline  
December 18th, 2009, 09:03 PM   #2
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From: Adelaide, Australia

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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.
aswoods is offline  
December 19th, 2009, 02:57 AM   #3
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From: Las Vegas

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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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