P(X \leq 8) = P(X < 8) + P(X = 8) for only discrete distributions. for some discrete distributions but not all. for all distributions. for only continuous distributions.
Added by Purificaci-N G.
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This is because the probability of a random variable being less than or equal to a certain value is equal to the sum of the probabilities of it being strictly less than that value and equal to that value. Show more…
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