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Answer on Statistics and Probability Question for Masearte

Question #5138
A contestant pays $5 to play the follwing carnival game. They roll two 6-sided dice and win an amount of dollars equal to the sum of the two numbers shown.(i.e. if they roll a 3 and a 6 they win $9)Calculate the expected value of the game. If a contestant plays 10 times how much can they expect to win/lose?(You must state if these are winnings or loses.)
Expert's answer
a-number on 1st dice
b- number on second
P(a+b=2) =1/36 1+1
P(a+b=3)=2/36 1+2 2+1
P(a+b=4)=3/36 1+3 2+2 3+1
P(a+b=5)=4/36 1+4 2+3 3+2 4+1
P(a+b=6)=5/36 1+5 2+4 3+3 4+2 5+1
P(a+b=7)=6/36 1+6 2+5 3+4 4+3 5+2 6+1
P(a+b=8)=5/36 2+6 3+5 4+4 5+3 6+2
P(a+b=11)=2/36 5+6 6+5
P(a+b=12)=1/36 6+6
So we have
so he in average wins $7
to make game fair he has to bet $7 instead of $5

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