If X has an exponential distribution, which of the following statements is corre

Question

If X has an exponential distribution, which of the following statements is correct?

A. The exponential distribution has the property that its mean equals its variance. B. All of the given statements are correct. C. The exponential distribution is governed by two parameters that determine its shape and location. D. The cumulative density function for an exponential random variable x has a bell-shaped graph. E. The exponential distribution is sometimes called the waiting-time distribution, because it is used to describe the length of time between occurrences of random events.

Explanation / Answer

correct option  E. The exponential distribution is sometimes called the waiting-time distribution, because it is used to describe the length of time between occurrences of random events.

mean and variance of exponential distribution of exponential distribution are not same.

exponential distribution has only one parameter.

  The cumulative density function for an exponential random variable x does not have a bell-shaped graph.

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