# Discrete_dist_week_3 - Discrete probability distributions...

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Discrete probability distributionsRandom variable Discrete random variable Probability mass functionCumulative distribution functionExpected valueVarianceEquations derived from the expected value and the variance
Random variableA random variable is a real valued function whose domain is a sample space. A random variable is denoted by an uppercase letter such us X. After an experiment is conducted, the measured value of the random variable is denoted by a lowercase letter such as xA discrete random variable is a random variable with a countable range (which can be finite or infinite).A continuous random variable is a random variable with an interval (i.e., portion of real numbers) for its range.
Random variable EXERCISES:Decide whether a discrete or continuous random variable is the best model for each of the following variables:(a)The time until a projectile returns to earth.
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