**961. The covariance of two independent random variable is ___________**

A. 1**B. 0**

C. – 1

D. Undefined

**962. The weight of persons in a state is a ___________****A. Continuous random variabl**e

B. Discrete random variable

C. Irregular random variable

D. Not a random variable

**963. In random experiment, observations of random variable are classified as ___________****A. Events**

B. Composition

C. Trials

D. Functions

**964. The expectation of a random variable X (E(X)) can be written as _________****A.ddt[MX(t)](t=0)**

B.ddx[MX(t)](t=0)

C.d2dt2[MX(t)](t=0)

D.d2dx2[MX(t)](t=0)

**965. If the probability of hitting the target is 0.4, find mean and variance.****A. 0.4, 0.24**

B. 0.6, 0.24

C. 0.4, 0.16

D. 0.6, 0.16

**966. If the probability that a bomb dropped from a place will strike the target is 60% and if 10 bombs are dropped, find mean and variance?**

A. 0.6, 0.24**B. 6, 2.4**

C. 0.4, 0.16

D. 4, 1.6

**967. If P(1) = P(3) in Poisson’s distribution, what is the mean?**

A. 2–√

B. 3–√**C. 6–√**

D. 7–√

**968. What is the mean and variance for standard normal distribution?****A. Mean is 0 and variance is 1**

B. Mean is 1 and variance is 0

C. Mean is 0 and variance is ∞

D. Mean is ∞ and variance is 0

**969. Find λ in Poisson’s distribution if the probabilities of getting a head in biased coin toss as 34 and 6 coins are tossed.**

A. 3.5**B. 4.5**

C. 5.5

D. 6.6

**970. If P(6) = λP(1) in Poisson’s distribution, what is the mean?(Approximate value)**

A. 4

B. 6**C. 5**

D. 7