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#### karush

##### Well-known member

- Jan 31, 2012

- 3,066

\(\displaystyle x\ \ \ P(X=x)\)

\(\displaystyle 1\ \ \ 0.3\)

\(\displaystyle 2\ \ \ 0.15 \)

\(\displaystyle 3\ \ \ 0.35 \)

\(\displaystyle 4\ \ \ 0.2 \)

find \(\displaystyle E[X]\)

I don't know what \(\displaystyle E[X]\) is