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help Problem. 18 : Find the mean, variance, and standard deviation of the random variable X associated with the probability density function over the indicated

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Problem. 18 : Find the mean, variance, and standard deviation of the random variable X associated with the probability density function over the indicated interval. f(z) = 34(2-2)(6-2); 25256 mean variance ? standard deviation ? Problem. 19 : Find the mean, variance, and standard deviation of the random variable X associated with the probability density function over the indicated interval. f ( z) =_; 1 5 I

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