Question

Find the mean of the distribution shown below.

X 2 3 4
P(X) 0.30 0.32 0.38

Answer 1

The mean value of a discrete probability distribution is known as the expected value and can be written E[X]
\[E[X]=\Sigma xp(x)\]
\[\sum_{}^{} xp(x)=2\times 0.30+.............\]

Answer 2

If you are able to use a calculator, I create List 1 and List 2 with those numbers. Then got to STAT, then to CALC and choose 1:1-Var Stats. Then hit enter and add L1 (List 1) comma L2 (List 2) and your answer is X with a bar on top. :) Hope this helps!