Discussion Forum



1)

The probability distribution  of a random variable X is given below

 1382021283_m1.PNG

The variance of X is 


A) 1.6

B) 0.24

C) 0.84

D) 0.75

Answer:

Option C

Explanation:

We have,

1382021127_d2.PNG

 Variance σ2= ∑PiX2i−(∑PiXi)2

=3.4−(1.6)2=3.4−2.56=0.84