Trill

02-03-2011, 10:41 PM

Can someone please help me out with this. I've been trying for about forty minutes, but I'm not getting this. Trust me, I've done everything I can to try to look up strategies/tips on these types of problems, but it's not helping. I REALLY appreciate any assistance!

32% of employed women have never been married. Suppose you randomly select 10 employed women and determine marital history.

1) What is the random var X of interest here? Define X. Is X binomial, geometric, or normal?

2) If 10 employed women are selected at random, what is the prb that 2 or fewer have never been married?

3) What are the mean and standard deviation of X?

4) Find the prb that the # of employed women who have never been married is within 1 standard deviation of its mean.

70% of Americans are overweight. Suppose that a # randomly selected are weighed.

5) Find the prb that 18 or more of the 30 students in a class are overweight

6) How many Americans would you expect to weigh before you encounter the first overweight individual?

7) What is the prb that it takes more than 5 attempts before an overweight person is found?

Thank you so so so so much if you could help! I really appreciate it!

32% of employed women have never been married. Suppose you randomly select 10 employed women and determine marital history.

1) What is the random var X of interest here? Define X. Is X binomial, geometric, or normal?

2) If 10 employed women are selected at random, what is the prb that 2 or fewer have never been married?

3) What are the mean and standard deviation of X?

4) Find the prb that the # of employed women who have never been married is within 1 standard deviation of its mean.

70% of Americans are overweight. Suppose that a # randomly selected are weighed.

5) Find the prb that 18 or more of the 30 students in a class are overweight

6) How many Americans would you expect to weigh before you encounter the first overweight individual?

7) What is the prb that it takes more than 5 attempts before an overweight person is found?

Thank you so so so so much if you could help! I really appreciate it!