911. A table with all possible value of a random variable and its corresponding probabilities is called ___________
A. Probability Mass Function
B. Probability Density Function
C. Cumulative distribution function
D. Probability Distribution

912. A variable that can assume any value between two given points is called ___________
A. Continuous random variable
B. Discrete random variable
C. Irregular random variable
D. Uncertain random variable

913. If a variable can certain integer values between two given points is called ___________
A. Continuous random variable
B. Discrete random variable
C. Irregular random variable
D. Uncertain random variable

914. The expected value of a discrete random variable ‘x’ is given by ___________
A. P(x)
B. ∑ P(x)
C. ∑ x P(x)
D. 1

915. If ‘X’ is a continuous random variable, then the expected value is given by ___________
A. P(X)
B. ∑ x P(x)
C. ∫ X P(X)
D. No value such as expected value

916. Out of the following values, which one is not possible in probability?
A. P(x) = 1
B. ∑ x P(x) = 3
C. P(x) = 0.5
D. P(x) = – 0.5

917. If E(x) = 2 and E(z) = 4, then E(z – x) =?
A. 2
B. 6
C. 0
D. Insufficient data

918. Value of [(n +1)⁄4]th term is the formula of
A.1st quartile
B.2nd quartile
C.mode
D.3rd quartile

919. The middle observation in an arranged set of data is called
A.mean
B.mode
C.median
D.range

920. The nth root of the product of the values x1, x2, x3, …..,xn is called
A.arithmetic mean
B.geometric mean
C.variance
D.harmonic mean