Discrete Random Variable Expectation (Jee Mains) | ExamDuo
Ask Doubts
Log in
Random Variables and Distributions
Medium
Discrete Random Variable Expectation
p.m.f. of a d.r.v X is :
P(x) =
x
n (n + 1)
; for x = 1, 2,...,n
= 0 ; otherwise,
then E (X) equals:
SELECT ONE OPTION
A
n
3
+
1
6
B
n
2
+
1
6
C
n
3
+
1
5
D
n
2
+
1
5
Check
Ask about this question