Probability Mass Function

Hi,

I have a question:

Let X be a random variable with a given PMF of:

x | 0 | 2 | 4 | 5
p(x) |0.15 | 0.30 | 0.30 | 0.25

I need to calculate
P[ 2 < X < 4]
would this simply be 0? The question does not specify whether it is a discrete random variable or a continuous random variable.
In the event it is a continuous random variable, how do I find the answer?

thanks.

Quote:

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Originally Posted by 99.95

Let X be a random variable with a given PMF of:
x | 0 | 2 | 4 | 5
p(x) |0.15 | 0.30 | 0.30 | 0.25
I need to calculate
P[ 2 < X < 4]
would this simply be 0? The question does not specify whether it is a discrete random variable or a continuous random variable.
In the event it is a continuous random variable, how do I find the answer?

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The pmf tells you that it is not a continuous random variable.

If it were then it has a completely different pmf.

ah, but of course!
Thanks.