document.write( "Question 1204473: The time spent waiting in the line is approximately normally distributed. The mean waiting time is 4 minutes
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Algebra.Com's Answer #840752 by ikleyn(52818) $\"\"$ $\"About$

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The time spent waiting in the line is approximately normally distributed. The mean waiting time is 4
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document.write( "This probability is the area under the specified normal curve on the right of the z-score z= 5 minutes.\r\n" );
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document.write( "To find the value, use the standard function normalcdf on your regular calculator TI-83/84.\r\n" );
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document.write( "The format is\r\n" );
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document.write( "    P = normalcdf(z1, z2, mean, SD)\r\n" );
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document.write( "In this problem, take z1 = 5 minute,  z2 = 9999 (as infinity); mean = 4 minutes (given);  SD = 1 = .\r\n" );
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document.write( "You will get  P = normalcdf(5, 9999, 4, 1) = 0.1587  (rounded).\r\n" );
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\n" ); document.write( "\n" ); document.write( "Alternatively, you can use free of charge online calculator at this web-page\r
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\n" ); document.write( "\n" ); document.write( "https://davidmlane.com/hyperstat/z_table.html\r
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\n" ); document.write( "\n" ); document.write( "Use it in the mode \"Area from a value\".\r
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