The probability distribution of a random variable X is 
Compute the mean, variance, and standard deviation of X.
Definitions:
Cnidarians
Cnidarians are a phylum of aquatic invertebrates known for their distinctive body structure characterized by a jelly-like middle layer and specialized cells called cnidocytes for capturing prey.
Ctenophores
Ctenophores, also known as comb jellies, are marine invertebrates characterized by their eight rows of ciliary plates used for swimming.
Mesoglea
Jellylike layer between the epidermis and gastrodermis in cnidarians and ctenophores.
Cnidaria
A phylum of aquatic invertebrates known for their distinctive body structure, which includes nematocysts, and comprises jellyfish, corals, and sea anemones.
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