What is the standard deviation of the following probability

What is the standard deviation of the following probability distribution?

0.15

What is the standard deviation of the following probability distribution?

2.6

4.7

5.4

3.9

0	0.20
2	0.05
4	0.35
6	0.25
	0.15 What is the standard deviation of the following probability distribution? 0 0.20 2 0.05 4 0.35 6 0.25 8 0.15 a. 2.6 b. 4.7 c. 5.4 d. 3.9

Solution

Consider:

Thus,  
  
Var(x) = E(x^2) - E(x)^2 =    6.76

Therefore,

s(x) = sqrt [Var(x)] =    2.6 [ANSWER, A]