For the following probability distribution:
|
X |
-4 |
-3 |
-2 |
-1 |
0 |
|
P(X) |
0.1 |
0.2 |
0.3 |
0.2 |
0.2 |
The mean E(X) is equal to:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → -1.8
$E(x)=∑x_iP(x_i)$
$=-4×0.1-0.2×3-2×0.3-1×0.2+0×0.2$
$E(x)=-1.8$