Cracking the SAT Math 1 & 2 Subject Tests, 2013-2014 Edition by Princeton Review

Author:Princeton Review [Review, The Princeton]
Language: eng
Format: epub
ISBN: 978-0-307-94574-7
Publisher: Random House Information Group
Published: 2013-04-15T14:00:00+00:00

PROBABILITY

Probability is a mathematical expression of the likelihood of an event. The basis of probability is simple. The likelihood of any event is discussed in terms of all of the possible outcomes. To express the probability of a given event, x, you would count the number of possible outcomes, count the number of outcomes that give you what you want, and arrange them in a fraction, like this:

* * *

Probability of x =

* * *

Not!

You can find the probability

that something WILL

NOT happen by subtracting

the probability that it

WILL happen from 1. For

example, if the weatherperson

tells you that there

is a 0.3 probability of rain

today, then there must be

a 0.7 probability that it

won’t rain, because

1 − 0.3 = 0.7.

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