document.write( "Question 165391: find the percent of the total area under the standard curve between the given z-scores. z = 2.18 and z = 3.45 \n" ); document.write( "

Algebra.Com's Answer #121984 by Fombitz(32388) $\"\"$ $\"About$

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We can find the area under the curve from $\"-infinity\"$ to $\"z=3.45\"$ and also from $\"-infinity\"$ to $\"z=2.18\"$ , subtract them and that will give us the area between $\"z=2.18\"$ and $\"z=3.45\"$ . We then multiply by 100 to get the percentage. I used EXCEL's NORMSDIST function with the given z scores to calculate areas.
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\n" ); document.write( " $\"A%5B3.45%5D=0.999720\"$
\n" ); document.write( " $\"A%5B2.18%5D=0.985371\"$
\n" ); document.write( " $\"DELTA%2AA=%280.999720-0.985371%29%2A100=%280.014348%29%2A100=1.43\"$
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\n" ); document.write( "1.43% of the curve's area is between z=2.18 and z=3.45. \n" ); document.write( "

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