1) "Find the variance 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) 9.4

2) "A researcher claims that the average wind speed in a certain city is 8 miles per hour. A sample of 32 days has an average wind speed of 8.2 miles per hour. The standard deviation of the population is 0.6 mile per hour. At alpha = 0.05, is there enough evidence to reject the claim? Use the P-value method."

a) There is enough evidence to accept the claim that the average wind speed is 8 miles per hour

b) Cannot be determined

c) There is enough evidence to reject the claim that the average wind speed is 8 miles per hour

d) There is no enough evidence to reject the claim that the average wind speed is 8 miles per hour

3) Frequency distribution in a continuous random variable has probability defined by?

a) likelihood

b) log likelihood

c) area under the curve

d) point value

4) Number of mobile sets is an example of

a) Discrete

b) Continuous

c) Constant

d) Not a applicable