1) "Find the Mean of f(x), where f(x) = 2X+2. The probability distribution of a random variable X ; if X = 2, 4, 5, 6, 7, and P(X) = 0.2, 0.25, 0.3, 0.15, 0.1 respectively"

a) 11

b) 37.5

c) 42

d) 77.5

2) "By investing ina particular stock, a person can make a profil in 1 year of Rs, 4000 with a probability of 40% and a loss of Rs. 1000 with a probability of 60%. What is the person's expected gain?"

a) 1000

b) 500

c) 2000

d) 200

3) Cumulative frequency graph of a continuous randome variable must have area equal to?

a) 2

b) 1

c) 0

d) 10

4) "Find the variance of f(x), where f(x) = 4X+4. The probability distribution of a random variable X ; if X = 7, 9, 10, 11, 12, and P(X) = 0.2, 0.25, 0.3, 0.15, 0.1 respectively"

a) 11

b) 37.5

c) 42

d) 37.6