What does it mean to call a distribution symmetrical?

Question

Thank you in advance.

Answer 1

Normal distribution, also called Gaussian distribution, the bell shaped curve is a good example of a symmetrical distribution where the left hand side is a mirror of the right hand side distribution, i.e. it is symmetric about the mean. Binomial distribution, Poisson distribution and exponential distribution are not symmetrical distributions.

Probablility Distributions like the above are useful to mathematicians, statisticians and physicists among others to draw reasonably accurate conclusions about a population based on fairly small samples.

Answer 2

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Answer 3

It means that at equal distances (+ or -) from the mean of the distribution, the frequencies will be approximately the same.