document.write( "Question 380337: Suppose the life of a certain brand of vacuum cleaner is normally distributed with a mean life of 12 years and a standard deviation of 4 years. A vacuum cleaner is randomly chosen. Find the probability that is will last more than 10 years. \n" ); document.write( "

Algebra.Com's Answer #269919 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "this was previously posted
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document.write( "*Note: 
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document.write( "  z = (16-12)/4 = 1
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document.write( "P(z = 1 ) = NORMSDIST(1) = .8413 
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document.write( " P(lasting more than 16 yrs) = 1 - .8413 = .1587  Or 15.87 % \n" );
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