document.write( "Question 820938: 1. Assume that police response time to emergency calls is normally distributed with a mean of 9 minutes and a standard deviation of 2 minutes. Determine the percent of emergency calls with a police response time less than 12.2 minutes. Round to the nearest hundredth. \r
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\n" ); document.write( "\n" ); document.write( "2. Assume that police response time to emergency calls is normally distributed with a mean of 9 minutes and a standard deviation of 2 minutes. Determine the percent of emergency calls with a police response time more than 7.8 minutes. Round to the nearest hundredth. \n" ); document.write( "

Algebra.Com's Answer #493779 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( " 1. z = (12.2-9)/2 = 3.2/2 = 1.6
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document.write( "  P(x <12.2min) = P(z< 1.6) = 94.52%
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document.write( "2. z = (7.8-9)/2 = -1.2/2 = -.6
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document.write( " P(x >7.8min) = P(z > .6) = 72.57% \n" );
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