Factorial n!, Product of all positive integers from 1 to n, Permutation, An arrangement where order matters, Combination, A selection where order does not matter, Discrete random variable, A random variable that takes only specific, separate values, Probability distribution, All possible values of a random variable together with their probabilities, Expected value, The long-term average value of a random variable, Variance, A measure of spread around the mean, Standard deviation, The square root of the variance, Binomial distribution, Models the number of successes in a fixed number of trials, Geometric distribution, Models the number of trials up to and including the first success, Continuous random variable, A random variable that can take any value within an interval, Normal distribution, A symmetric, bell-shaped distribution defined by mean and standard deviation, Standardisation, Converting a normal variable to a standard normal variable, Normal approximation to the binomial, Approximating a binomial distribution using a normal distribution when conditions are satisfied, Continuity correction, Adjusting discrete values by ±0.5 when using a normal approximation.

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