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Additional Mathematics
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Additional Mathematics
Random Variable (1)
Additional Mathematics
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Random Variable (1)
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Random variable
A variable with numeric values that can be determined from a random phenomenon
Discrete random variables
Random variables that have countable numbers of values, usually taking values like zero and positive integers
Continuous random variables
Random variables that are not integers but take values that lie in an interval
Probability distribution of discrete random variables
Lists all possible outcomes along with their respective probabilities, providing a summary of the likelihood of each outcome occurring
Tables of probability distributions
Each outcome is listed along with its corresponding probability, facilitating calculation and analysis
Graphs of probability distributions
Using bar graphs or histograms, with each bar representing an outcome and its height corresponding to its probability
Expected value (1)
The weighted average of all possible outcomes
Expected value (2)
Calculated by multiplying each outcome by its probability and summing the results
Cumulative distribution function
Probability that X will take on a value less than or equal to a specified value and denoted as F(x)
Probability mass function
A discrete random variable X is exactly equal to a specified value and denoted as P(X=x)
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