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The arrow in the graph below points to the area to the left of x . This area is represented by the probability P ( X x ) . Normal tables, computers, and calculators provide or calculate the probability P ( X x ) .

The area to the right is then P ( X x ) = 1 - P ( X x ) .

Remember, P ( X x ) = Area to the left of the vertical line through x .

P ( X x ) = 1 - P ( X x ) = . Area to the right of the vertical line through x

P ( X x ) is the same as P ( X x ) and P ( X x ) is the same as P ( X x ) for continuous distributions.

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Source:  OpenStax, Principles of business statistics. OpenStax CNX. Aug 05, 2009 Download for free at http://cnx.org/content/col10874/1.5
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