Question

Consider the following data: x 1 2 3 4 5 P(X=x) 0.2 0.2 0.2 0.2 0.2...

Consider the following data:

x 1 2 3 4 5

P(X=x) 0.2 0.2 0.2 0.2 0.2

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

Homework Answers

Answer #1

Solution:

x P(x) x * P(x) x2 * P(x)
1 0.2 0.2 0.2
2 0.2 0.4 0.8
3 0.2 0.6 1.8
4 0.2 0.8 3.2
5 0.2 1 5
Sum 1 3 11

Mean = X * P(X)

= 3

Variance = 2  =

= X 2 * P(X) - 2

= 11 - (3)2 = 2

Variance = 2 = 2

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