document.write( "Question 1207253: 使用标准法线表查找指定区域。\r
\n" ); document.write( "\n" ); document.write( "在平均值以下一个标准差和平均值以上两个标准差之间。（根据需要四舍五入到小数点后四位。 \n" ); document.write( "

Algebra.Com's Answer #845030 by ikleyn(52803) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "Find the specified area using a standard normal table.
\n" ); document.write( "Between one standard deviation below the mean and two standard deviations above the mean.
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document.write( "Use the empirical rule.\r\n" );
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document.write( "Between one standard deviation below the mean and two standard deviations above the mean, the area is\r\n" );
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document.write( "     +  = 0.34 + 0.475 = 0.815,  approximately.\r\n" );
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\n" ); document.write( "\n" ); document.write( "The Empirical Rule states that 68% of the data falls within one standard deviation,
\n" ); document.write( "95% percent within two standard deviations, and 99.7% within three standard deviations from the mean.\r
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