The following join probability data apply to fatigue test to run on bronze strips. X represent to failure  (in 10⁵) when alternate strips are bent at a high level of deflection. Y represent the same at a lower deflection level.

X/Y	20	30	40	50
4	0.01	0.03	0.05	0.02
5	0.03	0.1	0.08	0.04
6	0.02	0.08	0.12	0.11
7	0.02	0.04	0.07	0.18

1. Find the marginal probability distribution for X and Y
2. Determine the conditional probability distribution of Y gives X = 5
3. Are x and Y independent