How to calculate the probability mass function of a grouped data?
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The distribution function , also called the cumulative distribution function (CDF) or cumulative frequency function, describes the probability that a variate takes on a value less than or equal to a number . The distribution function is sometimes also denoted (Evans et al. 2000, p. 6). ... "Probability Functions."
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The probability mass function, f(x) = P(X = x), of a discrete random variable X has the following properties: All probabilities are positive: fx(x) ≥ 0. Any event in the distribution
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