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[" 21.If a random variable "x" assumes t...

[" 21.If a random variable "x" assumes the values "0,1" and "2" with probabilities "0.30,0.50" and "0.20,],[" then its expected value is "],[[" (a) "1.50," (b) "3],[" (c) "0.90," (b) "3]]

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