Probability for a Range of a Normal Distribution

Normal -> NormalProbRange

This applet computes the probability for a specified range. Use the text boxes to specify the mean and standard deviation of the normal distribution and to specify the the beginning and ending range for the probability to be calculated. To obtain probabilities for P(x < a) or P(X > a), specify an extreme value for the beginning or ending, respecitvely value and the probability will be accurate to at least three decimal places.

When the page loads, the applet displays the values for Example 4.8(c).

Example 4.9

This example computes the probability that a score will be between 75 and 90 on a standardized college entrance examination having a mean of 75 and a standard deviation of 90.

HTML and PARAM Tags

Below is sample code to place this applet on an html page. The codebase is specified relative to the html file and does not need to be "../../lib" as below.

<applet code="com.bolderstats.normal.NormalProbRange.class" 
    width="400" height="375" 
	codebase="../../lib" 
    archive="bolderstats_obf.jar,jmsl_obf.jar" />
	<param name="MEAN"  value="50">
	<param name="STDEV" value="10">
	<param name="START" value="40">
	<param name="END"   value="65">
	<param name="DECIMAL" value="0.00000">
</applet>

MEAN: The mean of the normal distribution. Default value is 50.
STDEV: The standard deviation of the normal distribuiton. Default value is 10.
START: The starting value for the range of values whose probability is to be computed. Default value is 40.
END: The ending value for the range of values whose probability is to be computed. Default value is 65.
DECIMAL: Indicates the number of decimal places desired in the display. "0.000" indicates 3 decimal places.