document.write( "Question 293513: Nationwide, the amount charged by doctors for performing a particular minor surgical procedure averages $1220 and varies with a standard deviation of $270. We randomly select 140 bills from the population of all bills charged for this surgery. Let x> represent the average amount charged for these 140 surgical procedures. \r \n" );
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document.write( "The probability that the average amount charged over these 140 procedures is less than $1200 is? \n" );
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