document.write( "Question 667101: The mean of a distribution is 15 and the standard deviation is 3. Which of the following values is unusual?\r
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\n" ); document.write( "\n" ); document.write( "A.20\r
\n" ); document.write( "\n" ); document.write( "B.22\r
\n" ); document.write( "\n" ); document.write( "C.10\r
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Algebra.Com's Answer #414857 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
 
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document.write( "Hi,\r
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document.write( "Important to Understand z -values as they relate to the Standard Normal curve:
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document.write( "Below:  z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.  
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document.write( "Note: z = 0 , 50% of the area under the curve is to the left and 50%  to the right
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document.write( "For the normal distribution: 
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document.write( "one  standard deviation from the mean accounts for about 68.2% of the set 
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document.write( "two standard deviations from the mean account for about 95.4% of the set****
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document.write( "and three standard deviations from the mean account for about 99.7%.\r
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document.write( "μ = 15 ,    σ = 3 
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document.write( "B. 22    > 2 standard diviations from the mean...UNUSUAL \n" );
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