Answer to Question #242165 in Statistics and Probability for ella

Question

The random variable  represents the amount gain by a person who buys a 20peso ticket from a total of 1000 tickets for a raffle whose winner will obtain ₱5,000.  

Answer 1

$P(X=-20)=0.999.$

$P(X=4980)=0.001.$

$E(X)=-20*0.999+5000*0.001=-14.98.$