Figure 28.17.
(*A*) An example of a discrete probability distribution *f*_{i} on the range *i* = 0, ..., 20. (*B*) This can also be represented as a **cumulative distribution** *F*_{i}, 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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