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# S1 - discrete random variables

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1. How do you work out the answer for the last question?
2. The last question is saying, the probability of obtaining an absolute value of r which is less than 3. An absolute value doesn't take the sign into account so -5 has an absolute value of 5 and likewise for all negative numbers. Therefore you can see that the values for this discrete random variable will include -1, 0 and 1 as they are less than 3 but not -5,-3 3 or 5 as their absolute values are equal to or grater than 3.
3. (Original post by alfmeister)
The last question is saying, the probability of obtaining an absolute value of r which is less than 3. An absolute value doesn't take the sign into account so -5 has an absolute value of 5 and likewise for all negative numbers. Therefore you can see that the values for this discrete random variable will include -1, 0 and 1 as they are less than 3 but not -5,-3 3 or 5 as their absolute values are equal to or grater than 3.
Thank you

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