Consider the following data:

Question

Question

x	-4	-3	-2	-1	0
P(X=x)	0.3	0.1	02	01	03

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

math Statistics-And-Probability

Answer 1

Answer #1

mean = sum of (x *P(x))
= -4 * 0.3 + -3 * 0.1 + -2 * 0.2 + -1 * 0.1 + 0 * 0.3
= -2.0

Variance = sum of (x -mean)^2 *P(x)

= (-4-(-2))^2 * 0.3 +( -3-(-2))^2 * 0.1 + (-2-(-2))^2 * 0.2 + (-1-(-2))^2 * 0.1 + (0-(-2))^2 * 0.3

variance = 2.6

Answer 2

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