Question

x 4 5 6 7 8 P(X=x) 0.3 0.2 0.2 0.1 0.2 Step 2 of 5...

x 4 5 6 7 8 P(X=x) 0.3 0.2 0.2 0.1 0.2

Step 2 of 5 : Find the variance. Round your answer to one decimal place. Answer

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Solution:

We have to find the variance for the given probability distribution.

Formula:

where

Thus we need to make following table:

x P(x) x*P(x) x^2 *P(x)
4 0.3 1.2 4.8
5 0.2 1 5
6 0.2 1.2 7.2
7 0.1 0.7 4.9
8 0.2 1.6 12.8

Thus

thus

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