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# Ps-3

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Current Student
Joined: 28 Dec 2004
Posts: 3357
Location: New York City
Schools: Wharton'11 HBS'12

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22 Oct 2005, 20:30
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Director
Joined: 21 Aug 2005
Posts: 790

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22 Oct 2005, 20:36
Accepted = y
will attend = 0.8y
class = x
What is y?
If prediction is true,
Will attend = class
So, x=0.8y => y=1.25x
VP
Joined: 13 Jun 2004
Posts: 1115
Location: London, UK
Schools: Tuck'08

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22 Oct 2005, 21:28
if you found difficulties to write the algebra , try to take a simple example, and try to avoid 100 because many times it could be true for a base 100 but then false when you use different data.

let's say we want 200 people to be enrolled, we know that the rate is 80/100 (100-20%) so now you can write :

80%X = 200
X=20000/80 = 250

so you need 250 accepted people to be sure that 200 people will be enrolled, which means that you need 250/200 = 125/100 = 1.25 more people than the enrollement objective
22 Oct 2005, 21:28
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