document.write( "Question 551048: : A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 30. \n" ); document.write( "

Algebra.Com's Answer #359317 by Edwin McCravy(20056) $\"\"$ $\"About$

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document.write( "z =  where  = \r
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document.write( "and where when n > 30, we use the approximation s ≈ .\r
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document.write( "So in this problem we use  ≈ s =  = 5\r
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document.write( "z =  =  = 21.21320344.\r
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document.write( "That's an extremely high z-score but that's what you would 
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document.write( "expect since 30 is so extremely far above the mean of 15.\r
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document.write( "Edwin  \n" );
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