• Want some good practice for the harder questions in the HSC exams?
    Join our 2021 BoS trial exam event for Maths Ext1, Maths Ext2 and Chemistry!
  • YOU can help the next generation of students in the community!
    Share your trial papers and notes on our Notes & Resources page

discrete why do i keep getting it wrong (1 Viewer)

yashbb

Active Member
Joined
Aug 15, 2021
Messages
157
Gender
Male
HSC
2022
Var(X) = E(X^2) - E(X)^2 = 2.6 - 0 = 2.6

E(X^2) = 4(0.3) + 1(0.1) + 0(0.2) + 1(0.1) + 4(0.3) = 2.6

E(X)^2 = (-2(0.3) - 1(0.1) + 0(0.2) + 1(0.1) + 2(0.3))^2 = 0
i did 0.2x0= 0.2...
Thank You!!!!!
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top