Question

If p.m.f. of r.v. X is given below.

x	0	1	2
P(x)	q2	2pq	p2

then Var(x) = ______

Options

• p²

• q²

• pq

• 2pq

Answer 1

If p.m.f. of r.v. X is given below.

x	0	1	2
P(x)	q2	2pq	p2

then Var(x) = 2pq