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

Determine and use the variance of a discrete random variable as a measure of spread, π‘‰π‘Žπ‘Ÿ (𝑋) = βˆ‘ 𝑝𝑖 (π‘₯𝑖 βˆ’ πœ‡)2 where 𝑝𝑖 is the probability of outcome π‘₯𝑖 occurring, πœ‡ is the mean.

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