document.write( "Question 1179110: The length of elephant pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 525 days and standard deviation 30 days. What percent of pregnancies last between 510 and 540 days?
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Algebra.Com's Answer #808659 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "Hi\r\n" );
document.write( "distribution approximately normal with µ = 525 and σ = 30\r\n" );
document.write( "The area in Red P(510 < x < 540) can be found by calculating P(x ≤ 540) - P(x ≤ 510)\r\n" );
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document.write( "Using z -values, |\r\n" );
document.write( "knowing P is always the area to the left of the z-value: \r\n" );
document.write( " P(z ≤ (15)/30) - P( z ≤ (-15)/30)  Use tables to determine P(Z-values) for subtraction:\r\n" );
document.write( "0r\r\n" );
document.write( " Using a TI calculator 0r similarly a Casio fx-115 ES plus\r\n" );
document.write( "Takes seconds:\r\n" );
document.write( "P(510 < x < 540) = normalcdf(510,540,525,30) = .3829\r\n" );
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document.write( "Important You are comfortable using Your calculator.  \r\n" );
document.write( "Wish You the Best in your Studies.\r\n" );
document.write( "Standard Normal Curve with various z-values\r\n" );
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