A random variable X has the following probability distribution: X… - Vidyadip

MCQ

A random variable X has the following probability distribution:

$X = x _{ i }$	1	2	3	4
$P = x _{ i }$	0.2	0.15	0.3	0.35

The mean and the variance are respectively ______.

A
3.8 and 1
✓
2.8 and 1.26
C
2.8 and 1
D
3.8 and 1.26

✓

Answer

Correct option: B.

2.8 and 1.26

B

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from MHT-CET PCM 05→MHT-CET PCM 05 — all question types→MHT - CET STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

A die is thrown 4 times. Getting an even number is considered a success. Then the variance of the distribution of success is ______

The negation of p → (~p ∨ q) is ______

Which of the following compounds does NOT react with sodium metal?

Ratio of pressures exerted by two gases is 4 : 3 and their densities are in the ratio 3 : 4. The ratio of their R.M.S. velocities is ____________.

Two rain drops falling through air have radii in the ratio 1 : 2. They will have terminal velocity in the ratio ______.

______ is a direct ancestor of modem man.

Sea water is a homogeneous mixture of ____________ type of solution.

The number of sigma bonds in paracetamol is ____________.

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15 `Omega`, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0-10 V is ____________.

Statement - 1: For practical purpose, the earth is used as a reference at zero potential in electrical circuits.

Statement - 2: The electrical potential of a sphere of radius R with charge Q uniformly distributed on the surface is given by `Q/(4piepsilon_0R)`.