Posted by **Anonymous** on Monday, September 24, 2007 at 12:16pm.

I was given a table that showed a simple random sample of adults' age and annual income living in suburb of a large city.

a) What is the probability that a person chosen at random from those in this sample will be the 31-45 age category? The answer I got is .43 or 43%.

b) What is the probability that a person chosen at random from those in this sample whose incomes are over $50,000 will be in the 31-45 age category? I found this to be .365, or 36.5%.

c) Bsed on your answers in parts a and b, is annual income independeent of age category for those in this sample? Explain. How do I prove this? I don't know what to do for this part.

- math -
**bobpursley**, Monday, September 24, 2007 at 12:27pm
It is not possible to critique answers a or b because the table is not here.

On c, again we need the table.

- math -
**Anonymous**, Monday, September 24, 2007 at 12:34pm
Here is the table:

Annual income

Age 25K-35K 35,001-50K Over 50K

21-30 8 15 27

31-45 22 32 35

46-60 12 14 27

Over 60 5 3 7

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