document.write( "Question 1189194: A statistical analysis of 1,000 long-distance telephone calls made by a company indicates that the length of these calls is normally distributed, with a mean of 270 seconds and a standard deviation of 30 seconds. What is the length of a call if only 1% of all calls are shorter? \n" ); document.write( "
Algebra.Com's Answer #820497 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! The z-value for 0.01 is -2.326 \n" ); document.write( "z=(x-mean)/sd=(x-270)/30 \n" ); document.write( "-69.8=x-270 \n" ); document.write( "x=200.2 minutes \n" ); document.write( " |