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Can the Poisson distribution be a continuous random variable or a discrete random variable?
True
Which distribution pattern has no order as to how it is distributed?
Random
Which distribution do not have mean?
The Cauchy or Cauchy-Lorentz distribution. The ratio of two Normal random variables has a C-L distribution.
Define a normal random variable?
I have included two links. A normal random variable is a random variable whose associated probability distribution is the normal probability distribution. By definition, a random variable has to have an associated distribution. The normal distribution (probability density function) is defined by a mathematical formula with a mean and standard deviation as parameters. The normal distribution is ofter called a bell-shaped curve, because of its symmetrical shape. It is not the only symmetrical distribution. The two links should provide more information beyond this simple definition.
Why random distribution patterns for species are the rarest in nature?
The reason why random distribution patterns for species are the rarest in nature is because of biotic and abiotic factors. These give rise to organisms being clustered or spread out.
