Question

Explain why this is or is not a probability distribution.

x
1
2
3
4

P(x)
0.2
0.1
0.4
0.2

Answer 1

The sum of p(x) over all possible values of x is 1, that is

∑jpj=1where j represents all possible values that x can have and pj is the probability at xj.

yes it is probability distributionall sum is 0.9
all probability between 0 and 1