Find the mean of this probability distribution. Round your answer to one decimal place

Question

x	P(x)
0	0.25
1	0.05
2	0.2
3	0.5

Find the mean of this probability distribution. Round your answer to one decimal place.

I got 1.95 and it was wrong

Answer 1

Hi Sela ,

Your answer is correct! It says round the answer to one decimal place so 1.95 would round to 2.0!

The mean is the expected value of X, E[X] = ∑ X × pr(X=x) .

E[X] = (0 × .25) + (1 × .05) + (2 × .2) + (3 × .5) = 1.95 ≈ 2.0