There are 100 sealed envelops in a box, 10 of them contain a cash prize of 100 each, 100 of them contain a cash prize of 50 each and 200 of them contain a cash prize of 10 each and rst do not contin any cash prize. If they are well shuffled and an evelope is picket up out, What is the probabiilty that it contains no cash prize?

There are 100 sealed envelops in a box, 10 of them contain a cash priz

1.	There are 100 sealed envelops in a box, 10 of them contain a cash prize of 100 each, 100 of them contain a cash prize of 50 each and 200 of them contain a cash prize of 10 each and rst do not contin any cash prize. If they are well shuffled and an evelope is picket up out, What is the probabiilty that it contains no cash prize?
Answer» Total number of sealed envelopes in a box, n(S)=1000 Number of evelopes containing cash prize=10+100+200=310 Number of envelops containing no cash prize, `n(E )=1000-310=690` `P(E )=(n(E ))/(n(S))=(690)/(1000)=(69)/(100)=0.69`