Calculating probablities can be used to help us make decision. PatrickJMT explains how to calculate probability in an "either A or not A" scenario. The probability of A plus the probability of not A is equal to one. Therefore, the probability of A is equal to one minus the probability of not A ; P(A)= 1  P(not A). The probability of a major earthquake in San Francisco over a period of time is used as an example. The probablity of an earthquake of a magnitude of 7.5 or greater in San Francisco in any given year is said to be 2 percent or 0.02. Assuming that the earthquakes are independent of each other, he calculates the probability of San Francisco having a major earthquake in the next 25 years. This is one minus 0.98 to the power of 25, or about 0.397. There is therefore an approximately 40 percent chance that San Francisco will have a major earthquake in the next 25 years. He shows us how the scenario gets worse for San Francisco over the next 50 and 100 years with increasing probabilities that a major earthquake will happen.
 Hot
 Latest

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the Percent Given Two Numbers

How To: Measure angles with a protractor in Geometry

How To: Remember "greater than" & "less than" symbols

How To: Solve problems involving functions in algebra

How To: Find the value of a variable in an algebraic equation

How To: Find the coordinate of a point

How To: Use and find x & yintercepts in algebra

How To: Work with linear, quadratic & exponential models

How To: Multiply variables

How To: Convert Fahrenheit to Celsius with a formula

How To: Divide small numbers by big numbers

How To: Translate a sentence into math symbols

How To: Figure out the domain & range of a piecewise function

How To: Find the formula of a piecewise function given a graph

How To: Calculate the area of a parallelogram

How To: Convert fractions to percents in two steps

How To: Find the 100th term in a sequence

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the Percent Given Two Numbers

How To: Measure angles with a protractor in Geometry

How To: Remember "greater than" & "less than" symbols

How To: Solve problems involving functions in algebra

How To: Find the value of a variable in an algebraic equation

How To: Find the coordinate of a point

How To: Use and find x & yintercepts in algebra

How To: Work with linear, quadratic & exponential models

How To: Multiply variables

How To: Convert Fahrenheit to Celsius with a formula

How To: Divide small numbers by big numbers

How To: Translate a sentence into math symbols

How To: Figure out the domain & range of a piecewise function

How To: Find the formula of a piecewise function given a graph

How To: Calculate the area of a parallelogram

How To: Convert fractions to percents in two steps

How To: Find the 100th term in a sequence
Be the First to Comment
Share Your Thoughts