GRE for Dummies, Premier 7th Edition by Ron Woldoff & Joe Kraynak

Author:Ron Woldoff & Joe Kraynak [Woldoff, Ron & Kraynak, Joe]
Language: eng
Format: epub
Tags: Study Aids, GRE (Graduate Record Examination)
ISBN: 9781118136843
Publisher: For Dummies
Published: 2011-12-06T06:28:31+00:00

The chances of getting two heads are one out of four. Note that the probability would be the same whether you toss one coin twice or toss two coins at the same time.

What’s the probability of tossing a die twice and getting a 5 on the first toss and a 6 on the second toss? Treat each toss separately.

The probability of getting a 5 is . The probability of getting a 6 is . Multiply consecutive probabilities:

Again, the probability is the same whether you toss one die twice or two dice at the same time.

Rule #3: Add either/or probabilities on a single event

An either/or probability on a single event is one in which either of two outcomes may occur; for example, the probability that you reach into a bag containing 10 blue, 10 red, and 10 green marbles and pull out a blue or a red marble. To solve an either/or probability problem, find the probability of each event separately and then add them together.

What’s the probability of tossing a die once and getting either a 5 or a 6? Either outcome has a one in six chance of occurring:

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