Which of the following is true about the probability density function (pdf) of a continuous random variable? cdf(y)-cdf(x) represents the probability the random variable is less than y but greater than or equal to x. You may assume y>x and cdf stands for the cumulative density function, O It can never be higher than one, because probabilities are never higher than one The area underneath it must be positive and strictly less than one O You have to be careful to note the '=' part of any inequalities when working out probabilities

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