<PRE><B>Question 185958</B>
use the empirical rule to estimate the area lying between values x=1100 and x=2600 under the normal curve that has mean 2100 and standard deviation 500. do not use calculator 
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z(1100) = (1100-2100)/500 = 2
z(2600) = (2600-2100)/500 = 1
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The area from z=0 to z=2 is (1/2)95% = 47.5%
The area from z=0 to z=1 is (1/2)68% = 34%
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So, the area from z=1 to z=2 is 47.5%-34% = 13.5%
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Cheers,
Stan H.</PRE>