Question 970724
Determine the expected value of X. 
X| 2 | 4 | 5 | 7 | 10
P|0.2|0.1|0.25|0.05|0.4 
A. 5.6
B. 5.95
C. 6.25
D. 6.4

Solution:
The expected value of X is equal to
{{{sum(xP(x)) = 2(0.2) + 4(0.1) + 5(0.25) + 7(0.05) + 10(0.4) = highlight(6.4)}}}
Answer: D. 6.4