Question

Why should the sum of the probabilities in a probability distribution always equal to 1?

Answer 1

Answer:

Probability is a number that can be assigned to outcomes and events. It always is greater than or equal to zero, and less than or equal to one. The sum of the probabilities of all outcomes must equal 1 . ... Two events A and B are independent if knowing that one occurs does not change the probability that the other occurs.

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Answer 2

Answer:

The sum of probabilities in a probability distribution is always equal to 1

Step-by-step explanation:

Formula Used:  $Probability = \frac{Favourable Outcomes}{Total Outcomes}$

• It is due to the fact that the probability distribution has to cover all the possible outcomes that can occur during a particular test case or scenario.
• The representation of a possible outcome is always 100% and it actually refers to 1, i.e we have to define all the possible outcomes. So it should add up to 1
• If the sum of probabilities is not equal to 1, then it is impossible to measure its probability of occurrence.