A symmetric probability distribution is a distribution that is unchanged when its probability density function or probability mass function is reflected around a vertical line at some value of the random variable. For example, a normal distribution is symmetric.

One issue with using a symmetric probability distribution when modelling problems is that it may not reflect the true shape of the data or phenomenon. Many real-world data sets are skewed, meaning they have more values on one side than the other. For example, income data is typically skewed right, meaning there are more low-income earners than high-income earners.

Another issue with using a symmetric probability distribution when modelling problems is that it may not capture outliers or extreme values that may be important for analysis or decision making. A symmetric distribution assumes that most values are close to the mean, but some data sets may have values that are far away from the mean and have a significant impact on the outcome.
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