Question

Find the expected value of the following probability distribution X -20 -10 30 75 80
P (x) 3/20 1/5 1/2 1/10 1/20
a) 20.5 b) 21.5 c) 22.5 d) 24.5

Answer 1

Answer:21.5

Step-by-step explanation:Acc. To me

FIRST- Multiply P(x)*X

-20*3/20=-3

-10*1/5=-2

30*1/2=15

75*1/10=7.5

80*1/20=4

SECOND -ADD THE ANSWER

I hope it help

-3-2+15+7.5+4=21.5