Determine whether each table describes a discrete probability distribution. Explain.
1.
x Pr(x)
1.........................- 1/5
2...........................1/4
3..........................5/10
4..........................9/20
2.
x Pr(x)
0.........................-4/5
1..........................2/5
2..........................3/5
3..........................4/5
3.
x Pr(x)
-1.........................1/4
1..........................3/8
2..........................1/4
4..........................1/8
4.
x Pr(x)
0..........................1/3
4..........................1/6
8..........................1/2
12...........................0