Continuous Probability Distribution


Comparison between discrete and continuous distributions.

Exhibit 33.13 Comparison between discrete and continuous distributions.

A comparison between discrete and continuous probability distributions is given in Exhibit 33.13. The probability distribution of a continuous random variable, X, is described by its probability density function (pdf), f(x).

$$Mean \,μ = \int_{-∞}^∞ x f(x)dx$$ $$Variance \,σ = \int_{-∞}^∞ (x-μ)^2 f(x)dx$$

For a given t, the cumulative distribution function (cdf) F(t) of a continuous random variable, X, is defined by:

$$F(t)=P(X≤t)=\int_{-∞}^t f(x)dx$$ $$F(-∞)=0,\,F(∞)=1 $$
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