21. 


(a) 0
(b) 1
(c) 2
(d) 3

Answer: (c)

22.

Answer: (c)

23. 

Answer: (b)

24. 

Answer: (a)

25. Consider the following data:
The mode is:
(a) 22.44
(b) 21.22
(c) 20.22
(d) 18.66

Answer: (c)

26. For the regression equations:
(a) 0.49
(b) 0.38
(c) 0.24
(d) 0.16

Answer: (c)

27. Recurrence formula for Poisson distribution is:

Answer: (b)

28. The diameter of an electric cable is assumed to be continuous random variable with Probability density function:
𝑓(𝑥)=6𝑥 (1−𝑥),  0≤𝑥≤1
Its mean will be:
(a) 0
(b) 1
(c) 1/2
(d) 1/20

Answer: (c)

29. The mean for normal distribution is:
(a) 3
(b) 2
(c) 1
(d) 0

Answer: (d)

30. What is the type of the following partial differential equation?
(a) Hyperbolic
(b) Parabolic
(c) Elliptic
(d) Circular

Answer: (b)