Question

How to find mean in probability mass function without?

Answer 1

Answer:

In short: p(x) is equal to P(X=x) . The mean μ (or expected value E[X] ) of a random variable X is the sum of the weighted possible values for X ; weighted, that is, by their respective probabilities. If S is the set of all possible values for X , then the formula for the mean is: μ=∑x∈Sx⋅p(x) .

Answer 2

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The mean μ (or expected value E[X] ) of a random variable X is the sum of the weighted possible values for X ; weighted, that is, by their respective probabilities. If S is the set of all possible values for X , then the formula for the mean is: μ=∑x∈Sx⋅p(x).