Question

Check My Work (1 remaining) eBook The following table provides a probability distribution for the random variable y. f(y) 0.20 0. 20 0.40 0.20 a. Compute Ely) (to 1 decimal). b. Compute Var(y) and o (to 2 decimals). Var(y) Check My Work (1 remaining) 0 - Icon Key Nuction 2017

Answer 1

	y	f(y)	y*f(y)	y^2*f(y)
	3	0.2	0.6	1.8
	5	0.2	1	5
	6	0.4	2.4	14.4
	9	0.2	1.8	16.2
sum	23	1	5.8	37.4

a)

Ans:

E(y) = y* f(y) = 5.8

b)

var(y) = y2 + f(y) - [E(y)] = 37.4 - 5.82 = 3.76

o= var(y) = 1.94