McGraw-Hill's PSATNMSQT by Christopher Black & Mark Anestis

Author:Christopher Black & Mark Anestis
Language: eng
Format: epub
Publisher: McGraw Hill LLC
Published: 2010-01-15T00:00:00+00:00

There are four ways of getting a sum of 5 out of a possible 36, so the probability is 4/36 or 1/9.

Geometrical Probability

A PSAT question may ask you to find the probability that something hits a certain region, like a dart hitting a dartboard. In these situations, the probability is just the ratio of the particular area to the entire area.

A landing target for skydivers consists of two concentric circles. The smaller circle has a radius of 3 meters, and the larger one has a radius of 6 meters. If a skydiver hits the target, what is the probability that she hits the smaller circle?

It might help to sketch the target:

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