document.write( "Question 1150251: The student council is hosting a drawing to raise money for scholarships. They are selling tickets for $7 each and will sell 500 tickets. There is one $1,000 grand prize, two $200 second prizes, and fourteen $10 third prizes. You just bought a ticket. Find the expected value for your profit. Round to the nearest cent. \n" ); document.write( "
Algebra.Com's Answer #771624 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! E(x)=sum x*p(x) \n" ); document.write( "=(1000-7)(1/500)+(200-7)(2/500)+(10-7)(14/500)-7(483/500), because $7 to play in the first place has to come out of the winning. \n" ); document.write( "=993/500+386/500+42/500-3381/500 \n" ); document.write( "=-1960/500 \n" ); document.write( "=-$3.92 (loss) \n" ); document.write( " |