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Homework answers / question archive / If Sam can purchase up to 3 ice cream cones and the probabilities that he/she purchases 0,1,2 or 3, are 0

If Sam can purchase up to 3 ice cream cones and the probabilities that he/she purchases 0,1,2 or 3, are 0.20, 0.45, 0.35 and 0.05 respectively, is this a valid probability distribution?

1. yes, as they are all positive

2. yes, as all are between 0 and 1

3. no, as they do not add to 1

4. no, as no probability is bwteen 0 and 1

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