Mathematical Methods Β· Unit 3 Β· Discrete random variables Β· General discrete random variables

Determine and use the mean (expected value) of a discrete random variable as a measurement of centre, 𝐸(𝑋) = πœ‡ = βˆ‘ 𝑝𝑖 π‘₯𝑖 where 𝑝𝑖 is the probability of outcome π‘₯𝑖 occurring.

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Determine and use the standard deviation of a discrete random variable, βˆšπ‘‰π‘Žπ‘Ÿ(𝑋), as a measure of spread.
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