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A biased coin with probability of getting head is twice that of tail, is tossed 4 times If a random variable X is number of heads obtained, then expected value ofX is : |
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Answer» ` ( 2 ) /(3 ) ` ` p = (2)/(3)` probability of GETTING head `q = (1)/(3)` probability of getting tail. ![]() `E(x)= Sum xi pi` ` = 0 (1)/(3^(4)) + 1XX (8)/(3^(4)) + 2 x(24)/(3^(4)) +4 xx (16)/(3^(4)) = (216)/(81)=(8)/(3)`` E (x)= (8)/(3)` . |
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