# Connexions

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Textbook by: Barbara Illowsky, Ph.D., Susan Dean. E-mail the authors

# Areas to the Left and Right of x

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

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

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

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

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

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