Figure 28.17. (A) An example of a discrete probability distribution fi on the range i = 0, ..., 20. (B) This can also be represented as a cumulative distribution Fi, which is the probability of drawing a value less than or equal to i. (C) The area under a probability density f(x) gives the probability that a continuous variable x lies within some range of values. For example, the blue shaded area gives the chance that x < 2.2 as
(D) The cumulative distribution F(x) gives the probability that the value is smaller than x; the point at x = 2.2, F(x) = 0.47 corresponds to the shaded area in C.
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