Question

Which table is a probability distribution table?

I did not mean to answer this so that's why it's selected so just ignore it

Answer 1

Answer: Choice B

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Step-by-step explanation:

The probability of some event is always between 0 and 1. The 0 referring to the idea its impossible to happen (ie "0 percent chance") and 1 refers to "absolute certainty (ie "100 percent chance").

In short,
`0 \le p \le 1` which means "p is between 0 and 1 inclusive"

With this in mind, we can rule out choice A because the 1.05 is larger than 1. Similarly, we can rule out choice D because of the negative probability values.

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It's now down between B or C

Add up the values in the bottom row for each table

for choice B, we have: 0.4+0.15+0.25+0.2 = 1

for choice C, we have: 0.2+0.35+0.15+0.25 = 0.95

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Choice B is the answer because all probability values are between 0 and 1, and the sum of adding them all up leads to 1

Choice C is ruled out because the sum is not 1, even though all individual probabilities are in the right interval.