Find E(X^2) when random variable X has normal distribution with mean(µ) = 7 and standard deviation
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Find E(X^2) when random variable X has
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- Suppose X is random variable with E(X^2)= 10 and E(X)=2. What is the variance of X? Suppose X is a random variable with Var(X) =20 and E(X^2). What is the mean of X?The life of an electronic device is known to have the exponential distributionwith parameter lamda=1/1000 .(i) What is the probability that the device lasts more than 1000 hours?(ii) What is the probability it will last less than 1200 hours?(iii) Find the mean and variance of the life of the electronic device.Show that the variance of a geometric random variable X; is given by V ar(X) = q/p^2 .
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