Question

If a discrete random variable X follows Poisson distribution with parameter 'm' then which of the following is correct?
2 points
(a) E(X)=V(X)
(b) E(X)>V(X)
(c) V(X)=m+1
(d) E(X)<V(X)​

Answer 1

Let the at A be x k

and the B be y k

when the is x−y

Dist=100km

⟾ =5 hours

∴  Dist =S×T

⟾ 100=(x−y)5

⟾ x−y=20⟶(I)

when THE is x+y

⟾ Dist=100km

⟾ t=1 hours

⟾ Dist=ST

⟾ 100=(x+y)1

⟾ x+y=100⟶(II)

Solving (I) & (II)

⟾ x−y=20

⟾ x+y=100

​⟾ 2x=120

⟾ x=60km/h

⟾ y=40km/h