document.write( "Question 872991: A sample of values has a mean of 500.0 and a standard deviation of 50.0. Use the Range Rule of Thumb to find estimates for the minimum and maximum “usual” values.
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Algebra.Com's Answer #526568 by ewatrrr(24785)\"\" \"About 
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(400,600) 2Sd either side of the mean
\n" ); document.write( "Below: z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.
\n" ); document.write( "Note: z = 0 (represents x-value of the mean)
\n" ); document.write( "50% of the area under the curve is to the left and %50 to the right
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\n" ); document.write( "For the normal distribution:
\n" ); document.write( "one standard deviation from the mean accounts for about 68% of the set
\n" ); document.write( "two standard deviations from the mean account for about 95%
\n" ); document.write( "and three standard deviations from the mean account for about 99.7%.
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