[BruceZ]

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In my statistics class I missed the lecture on this stuff. Our book gives hardly any examples and there is a mid-term tomorrow. I am meeting w/ my professor, but not til after the mid-term. Any of you have any websites that give info or you personally have info on how to do these problems? For instance a problem could be:

Suppose X has a density function f(x)=4x^3 for 0<x<1, 0 otherwise. Find the distribution function and P(X<1).

Basically I am just asking how you start these problems and the procedure you go through to complete them. Any help is appreciated. Thanks in advance.

SGS

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The distribution function is just the integral of the density function from minus infinity to t, and it tells you the probability that X lies between minus infinity and t, or P(X<=t). Replace the integral with a sum for a discreet density function.