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In a game of throwing 3 coins, a plater ...

In a game of throwing 3 coins, a plater will loose Rs.5/-for each head and gain Rs.10/-for each tail. IF a random variable `X:StoR` is defined as X(a)=net gain (a E s) the mean of random variable is (in rupees)

A

`15/2`

B

`-15/2`

C

`15`

D

`25`

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The correct Answer is:
A
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