Statistics for Data Science II, Week-wise practice

Undated, Set week-03

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Question 1

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The pmf of a random variable $X$ is

$\begin{array}{c|cccc} x & 0 & 1 & 2 & 3 \\ \hline P(X=x) & 0.3 & 0.4 & 0.1 & 0.2 \end{array}$

Find $E(X)$.

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The pmf of a random variable $X$ is $$\begin{array}{c|cccc} x & 0 & 1 & 2 & 3 \\ \hline P(X=x) & 0.3 & 0.4 & 0.1 & 0.2 \end{array}$$ Find $E(X)$. The pmf of a random variable $X$ is $$\begin{array}{c|cccc} x & 1 & 2 & 3 & 4 \\ \hline P(X=x) & 0.4 & 0.3 & 0.1 & 0.2 \end{array}$$ Find $E(X)$. The pmf of a random variable $X$ is $$\begin{array}{c|cccc} x & -1 & 0 & 1 & 2 \\ \hline P(X=x) & 0.4 & 0.2 & 0.2 & 0.2 \end{array}$$ Find $E(X^2)$.