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For given Exercise, are income and age independent?

Exercise
For the following probabilities, determine

(a) the probability that someone is under 30,

(b) the probability that someone has a high income given that he or she is under 30,

(d) the probability that someone has a medium income given that he or she is over 50.

Age	Income
Age	High	Medium	Low
<30	.030	.180	.090
30-50	.052	.312	.156
>50	.018	.108	.054

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