If X is a discrete random variable. then P(X≥a)=________.

(a)

P(X

(b)

1-P(X≤a)

(c)

1-P(X

(d)

0

If X is a continuous random variable. then P(X≥a)= _________.

(a)

P(C)

(b)

1-P(X>a)

(c)

P(X>a)

(d)

1-P(X≤a-1)

If X is a discrete random variable., then which of the following is correct?

(a)

0≤F(x)≤1

(b)

F(-∞)=0,F(∞)≤1

(c)

P(X=X_n)=F(X_n)-F(X_n-1)

(d)

F(x) is a constant function

Which of the following are correct?
(i) E(aX+b) = a E(X) + b
(ii) μ₂ = μ₂¹ - (μ₁¹)²
(iii) μ² = variance
(iv) V (a X + b) = a² V(x)

(a)

all

(b)

i, ii and iii

(c)

ii and iii

(d)

i and iv

A discrete random variable. X has the probability mass function p(x), then __________ is true.

(a)

0≤P(X)≤1

(b)

P(X)≥0

(c)

P(X)≤1

(d)

0