document.write( "Question 437771: In a study of the time college freshmen use to study each week, it is found that the
\n" ); document.write( "mean is 6.8 hours with a standard deviation of 2.5 hours. If 100 freshmen are
\n" ); document.write( "randomly selected, what is the probability that their mean weekly study time
\n" ); document.write( "exceeds seven hours? \n" ); document.write( "

Algebra.Com's Answer #302832 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi
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document.write( "*Note: 
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document.write( "In a study of the time college freshmen use to study each week,
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document.write( "mean is 6.8 hours with a standard deviation of 2.5 hours
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document.write( "Sample size n = 100 Find: P(X > 7hr)   
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document.write( " z = (7-6.8)/(2.5/10) = .2/.25 = .8
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document.write( "P(z >.8) = 1 - .7881 = .2119 \n" );
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