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

(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

(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

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

(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

(b) Parabolic

(c) Elliptic

(d) Circular

**Answer: (b)**

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