1) "Find the expectation of a random variable X? if X = 8 ,10, 11, 12, 13, and P(X) = 0.2, 0.25, 0.3, 0.15, 0.1 respectively"

a) 11.5

b) 10.5

c) 2.5

d) 4.5

2) "If a random variable has a probability distribution whose graph is continuous, bellshaped, and symmetric, it is called as "

a) Hypergeometric Distribution

b) Uniform Distribution

c) Poisson Distribution

d) Normal Distribution

3) "Suppose we have two populations, one with a smaller variance than the other. We take two samples of the same size, one from each population, and work out a 95% confidence interval for each mean. The confidence interval for the population with the larger variance will be:"

a) Narrower

b) Wider

c) Same width

d) Same value

4) The normal distribution is for continous variables

a) TRUE

b) FALSE

c) Both option a and b

d) answer not given