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Section 5-2

random variable a variable( tyically represented by x) that has a single numerical value, determined by chance, for each outcome of a procedure
Probability distribution a sescription that gives the probability for each value of the random variable; often expressed in the format of a graph, table, or formula
Continuous random variable infinitely many values, and those values can be associated with measurements on a continuous scale without gaps or interruptions
Discrete random variable either a finite number of values or countable number of values, where "countable" refers to the fact that there might be infinitely many values, but they result from a counting process.
Unusually high x successes among n trials is an unusually high number of successes if p(x or more) is less than or equal to 0.05
unusually low x successes among n trials is usually low number of success if p(xor fewer) is less than or equal to 0.05
range rule of thumb most values should lie within 2 standard deviations of the mean.
expected value of a discrete random variable is denoted by E, and it represents the mean value of the outcomes.
Created by: crickie11