33hmm...
somebody(guess who? hmmmmmmmmmmmmmm.. [3]) asked me this..
answer sayad galat hai.....
In a game , a man wins a rupee for a six and loses a rupee for any other number when a fair die is rolled. The man decided to throw a die thrice but to quit as and when he gets a six . Find the expected value he wins or loses.
I know its ncert but i have a doubt in the answer
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UP 0 DOWN 0 0 6
6 Answers
33
621/6+5/6.1/6.0+(-1).5/6.5/6.1/6-3.5/6.5/6.5/6
=1/6-25/216-375/216
=-399/216
=-133/72
expected loss is 133/72
unless i have lost it when it comes to calculation mistakes :P
1sir i can understand ur answer but my question is how his expected loss can be in fractions when he is dealing oly in multiples of 1. Doesn tat make our expected loss calculation impractical?
62no dark knight..
your doubt is very genuine and good one...
See let us take a game where i lose 1 rupee or win 1 rupee with equal probability.
If i play a lot of games or even 1 game, The expecation is 1/2-1/2 = 0
but 0 will not be any of the outcomes.
Either i will win or lose...
So you should appreciate that the expected value might never be achieved
Another example.
Look at the average of a cricketer... 55.46 (That is his expected score)
But can a cricketer score fractional runs?
1thank u bhaiyya...............ya brilliant examples [4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4][4]