which of the following probability distribution types has a mean, median, and mode that are all equal…

Brief Explanations:

In a symmetric probability - distribution, the data is evenly distributed around the center. So, the mean (average), median (middle value), and mode (most frequent value) coincide. In a constant distribution, there is only one value, so mean = median = mode. But symmetric is a more general case that also satisfies this property. Positively and negatively skewed distributions have different mean, median, and mode values due to the asymmetry of the data.

Answer:

B. symmetric