Standard distributions

Normal distribution is symmetric about?
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Standard normal distribution has which of the following properties?
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A random variable P follows exponential distribution with mean value 0.5. The expectation of P^2 will be?
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The number of parameters in the exponential and binomial distributions, respectively are?
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If calls arrive at a telephone exchange such that the time of arrival of any call is independent of the time of arrival of earlier or future calls, the probability distribution function of the total number of calls in a fixed time interval will be?
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