Question

 A lottery will be conducted by the Grade 11 students of MNHS to help a fellow student who needs to undergo 

an operation. Out of four hundred tickets to be sold, only one ticket will win ₱2,000 and the rest will win nothing. 

If you will buy a ticket, calculate for your expected gain.

Answer 1

$E(X)=2000*\frac{1}{400}+0*\frac{399}{400}=50.$