document.write( "Question 1140431: If the random variable z is a Standard Normal Score,
\n" ); document.write( "what is P(-2.00 ≤ z ≤ +2.00)? How did you find this
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Algebra.Com's Answer #761030 by MathLover1(20849) $\"\"$ $\"About$

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From the cumulative normal distribution table, \r
\n" ); document.write( "\n" ); document.write( " $\"P%28z+%3C=+2.00%29+=+0.97725\"$ .\r
\n" ); document.write( "\n" ); document.write( " $\"P%28z+%3C+-2.00%29\"$
\n" ); document.write( "= $\"1+-+P%28z+%3E=+-2.00%29\"$
\n" ); document.write( "= $\"1+-+P%28z+%3C=+2.00%29+\"$ .....by symmetry of the normal distribution
\n" ); document.write( "= $\"1+-+0.97725\"$
\n" ); document.write( " = $\"0.02275\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"P%28-2.00+%3C=+z+%3C=+2.00%29\"$
\n" ); document.write( "= $\"P%28z+%3C=+2.00%29+-+P%28z+%3C+-2.00%29\"$
\n" ); document.write( "= $\"0.97725+-+0.02275\"$
\n" ); document.write( "= $\"0.9545+\"$ ->answer\r
\n" ); document.write( "\n" ); document.write( " $\"P%28-2.00+%3C=+z+%3C=+%2B2.00%29=0.9545+\"$
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