document.write( "Question 955029: The lengths of boards are normally distributed with a mean of 3.9m and a standard deviation of 1.8m. Seventy-five percent of the boards are less than what amount?\r
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Algebra.Com's Answer #583335 by Fombitz(32388) $\"\"$ $\"About$

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Find the z score when $\"P=0.75\"$ .
\n" ); document.write( "The corresponding z score is $\"z=0.674\"$ .
\n" ); document.write( " $\"0.674=%28x-3.9%29%2F1.8\"$
\n" ); document.write( " $\"x-3.9=1.2132\"$
\n" ); document.write( " $\"x=5.11\"$ $\"m\"$
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