Question

Select the correct answer.
y Probability
10 0.10
20 0.25
30 0.05
40 0.30
50 0.20
60 0.10
The probability distribution of y, a discrete random variable, is given in the table. What is the expected value of y?

A.
25.0
B.
26.5
C.
35.0
D.
35.5

Answer 1

Expected value = sum y * P(y) = 10(.10)+20(.25)+30(.05)+40(.30)+50(.20)+60(.10) = 1+5+1.5+12+10+6 = 35.5.

Answer: D.