3. Determine whether each of the distributions given below represents a probability distribution. Justify answer
a) x |1 | 2 | 3 | 4
P(x) |1/8| 1/8| 3/8 | 1/8
The sum of probabilities must be equal to 1.
In the first "distribution" the sum is , so isn't a distribution.
In the second the sum is equal to 1, so it is a corect distribution.