Banner Ad 1

Collapse

Announcement

Collapse
No announcement yet.

HELP........Geometric...seems strange

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • HELP........Geometric...seems strange

    hi everyone...
    I just encountered a problem...quite strange.....It is the first time that I am wondering the answer is wrong actually.

    The problem is :
    A fair die is tossed until the first 5 appears. Let X denotes the random variable equal to the number of tosses required.
    Compute E[14X].

    seems quite easy at first...I thought this is a geometric distribution
    and E(14x) = 14E(x) then E(x) = 6. woo...then the answer comes out...

    but the right answer is 119.....completely lost

    Plz help...A million thanks!!!!

  • #2
    I alSo got E(X)= 6 and then E(X)= 14(6)=84. what manual is that?

    Comment


    • #3
      Originally posted by examp View Post
      I alSo got E(X)= 6 and then E(X)= 14(6)=84. what manual is that?
      Hi
      Thanks for answering me. I have struggled a lot ........This problem is from Saab.org. someone here encouraged me to go over that site.

      Comment


      • #4
        Heh, that's odd. Maybe it's an 8 and a half sided die..
        Last edited by /nick.b; May 30 2010, 12:50 AM.

        Comment

        Working...
        X