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If you can do one task n number of ways and a second m number of ways, then both tasks can be done in n*m ways.
Two events A and B are disjoint if they have no outcomes in common. P(A or B)=P(A)+P(B)
Probability rule 3
random variable with either a finite (whole) number value or a countable number
Discrete random variable
takes all values in an interval of numbers, described by a density curve.
Continuous random variable
mean of X = multiply each possible value by its probability and then add it up
Mean of a discrete random variable
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