A continuous random variable X has the exponential distribution with parameter 6>0 and it bas a pdf of the form x>0 and zero otherwise. Please prove that P[X>a+t[X>a]-P[X>t]

A random variable X represents the number of defective mobile phone is a shipment of four iPhones to a local mobile phone stor(E) Assume that each mobile phone is equally likely to be defective or non-defective, and also assume that each mobile phone is defective or non-defective independently of the other mobile phones. Then the expected number of defective mobile phones is _______.

A continuous random variable X has the exponential distribution with parameter 6>0 and it bas a pdf of the form x>0 and zero otherwise. Please prove that P[X>a+t[X>a]-P[X>t]

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