document.write( "Question 312585: A highway inspector needs an estimate of the mean weight of trucks crossing a bridge on the Interstate highway system. She selects a random sample of 49 trucks and finds a mean of 15.8 tons with a sample standard deviation of 3.85 tons. The 90 percent confidence interval for the population mean is: \n" ); document.write( "

Algebra.Com's Answer #286911 by danahardy76(1) $\"\"$ $\"About$

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