random variable X

[anwer_khurshid]

I am a statistician and having a problem to understand that which one is correct:

i) random variable X has ...
or
ii) random variable X have ....

I tried to google both phrases and it came out 495000 and 90400 sites respecively, which means both can be used. Am I correct? If not then which is preferred by you people.

Similarly I would like to know aboutthe followings:

Let X denote
or
Let X denotes

Which one is correct.

Thanking you in advance.

[SoothingDave]

Random variable X has... ("X" is singular.)

Let X denote... (But "X denotes...")

[5jj]

'Random variable x has ...' - singular
Let x denote...' - singular