document.write( "Question 1035691: The mean of a normal probability distribution is 60, the standard deviation is 5.
\n" ); document.write( "About what percent of the observations lie between 55 and 65?\r
\n" ); document.write( "\n" ); document.write( "About what percent of the observations lie between 50 and 70?\r
\n" ); document.write( "\n" ); document.write( "About what percent of the observations lie between 45 and 75? \n" ); document.write( "

Algebra.Com's Answer #650357 by robertb(5830) $\"\"$ $\"About$

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55 to 65 are 1 standard deviation from the mean 60, and hence by the empirical rule, around 68% of all observations lie bet ween 55 and 65.\r
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\n" ); document.write( "\n" ); document.write( "50 to 70 are 2 standard deviations from the mean 60, and hence by the empirical rule, around 95% of all observations lie bet ween 50 and 70.\r
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\n" ); document.write( "\n" ); document.write( "45 to 75 are 3 standard deviations from the mean 60, and hence by the empirical rule, around 99.7% of all observations lie bet ween 45 and 75. \n" ); document.write( "

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