Finding Probabilities for Intervals of a Normal Distribution

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This Demonstration lets you compute the probability of any interval for a normal distribution. Input the mean and standard deviation (parameters and ) and use the sliders to set the two bounds of the interval. The output shows a plot of the area lying below the probability density function and enclosed by the limits, and the value of this probability above the plot. At the bottom you can see the left or right tail probabilities.

Contributed by: Juan D. Montoro-Pons (January 2010)
Open content licensed under CC BY-NC-SA


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