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# Edexcel S2; Cumulative Distribution Function watch

1. Hello All,

Can someone clarify something for me;

I'm working through the S2 Edexcel text book and currently trying to get my head around the Cumulative Distribution Function section.
I'm beginning to understand it but there was one point I wanted to get clarified;

The text book explains that F(x) = P(X<=x) and I have been using this idea to work out probabilities however in one of the exercise questions we're asked to find P(X<x) and in the answer section this seems to have been worked out in exactly the same way as P(X<=x).

I have attached a copy of the question; I'm concerned with part c).

In short; can someone confirm that if you get a question of the form Find P(X<x) it is worked out in the same way as P(X<=x). (Or is there something specific in this question that I have missed).

Thanks.

BTW I'm a mature student and study when I have the time (hence why I'm getting an early start on this module).
Attached Images
2. S2 Chapter 3 Ex B Q8.pdf (355.3 KB, 73 views)
3. (Original post by Forest10)
Hello All,

Can someone clarify something for me;

I'm working through the S2 Edexcel text book and currently trying to get my head around the Cumulative Distribution Function section.
I'm beginning to understand it but there was one point I wanted to get clarified;

The text book explains that F(x) = P(X<=x) and I have been using this idea to work out probabilities however in one of the exercise questions we're asked to find P(X<x) and in the answer section this seems to have been worked out in exactly the same way as P(X<=x).

I have attached a copy of the question; I'm concerned with part c).

In short; can someone confirm that if you get a question of the form Find P(X<x) it is worked out in the same way as P(X<=x). (Or is there something specific in this question that I have missed).

Thanks.

BTW I'm a mature student and study when I have the time (hence why I'm getting an early start on this module).
Yes, for a continuous random variable
4. Many thanks.

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