Question

Let the p. m. f. of a random variable X be __

P(x) = `(3-x)/10` for x = -1,0,1,2

= 0                        otherwise

Then E(X ) is ________.

विकल्प

• 1

• 2

• 0

• -1

Answer 1

0

x	-1	0	1	2
P(x)	`4/10`	`3/10`	`2/10`	`1/10`
x.P(x)	`(-4)/10`	0	`2/10`	`2/10`

`sum x.P(x) = 0`