71.

A random variable X has Poisson distribution with mean 2. Then P(X > 1.5) equals

• 2/e²

• 0

• 
• 

A and B are two like parallel forces. A couple of moment H lies in the plane of A and B and is contained with them. The resultant of A and B after combining is displaced through a distance

• 2H/A-B

• H/A+B

• H/2(A+B)

• H/2(A+B)

The resultant R of two forces acting on a particle is at right angles to one of them and its magnitude is one-third of the other force. The ratio of larger force to smaller one is 

• 2 : 1

• 

• 3:2

• 3:2

The plane x + 2y – z = 4 cuts the sphere x² + y² + z² – x + z – 2 = 0 in a circle of radius

• 3

• 1

• 2

• 2

Let x₁, x₂, …,x_n be n observations such that  Then a possible value of n among the following is

• 15

• 18

• 19

• 19