CUET Preparation Today
CUET
-- Mathematics - Section B1
Probability
For the following probability distribution:
X
-4
-3
-2
-1
0
P(X)
0.1
0.2
0.3
The mean E(X) is equal to:
-1.8
-1.6
The correct answer is Option (2) → -1.8
$E(x)=∑x_iP(x_i)$
$=-4×0.1-0.2×3-2×0.3-1×0.2+0×0.2$
$E(x)=-1.8$
