SOLUTION: Hi, I have no idea how to solve this problem. In fact, I'm completely confused...can someone help me out? Thank you very much!! Consider the probability distribution shown

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Question 632884: Hi, I have no idea how to solve this problem. In fact, I'm completely confused...can someone help me out? Thank you very much!!

Consider the probability distribution shown below and answer the following questions. Show calculations for each computation.
x -4 -3 -2 -1 0 1 2 3 4
P(x) 0.02 0.07 .10 .15 .3 .18 .10 .06 .02
Answer Calculations
Calculate μ
Calculate σ^2 and σ

Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website!

Hi, Previously Posted
Calculate the Expected Value(Sum of PX) = μ = 0
Then Calculate the Variance(Sum of P[X-μ]^2) = 2.94
σ =
X P PX P[X-μ]^2
-4 0.02 -0.08 0.32 Note:
-3 0.07 -0.21 0.63
-2 0.1 -0.2 0.4
-1 0.15 -0.15 0.15
0 0.3 0 0
1 0.18 0.18 0.18
2 0.1 0.2 0.4
3 0.06 0.18 0.54
4 0.02 0.08 0.32
Sum 0 2.94