Ask Experts Questions for FREE Help !
Ask
    LisaMK1957's Avatar
    LisaMK1957 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 10, 2013, 06:38 AM
    pool 3,000 people, randomly select 5%, what r odds of being picked each time
    I have a pool of 3000 people. I need 5% of that pool randomly selected in the result set.

    If I run my code, assigning a random number then pulling the Top 5%.

    I seem to get some of the same people in the result set each time I run my code.

    What is the probability or odds of this happening?

    Thank you for any help you can offer.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
    		  
    #2

    Oct 10, 2013, 08:21 AM
    The probability of getting some of the same people is quite high. The probability of having no duplicates in selecting 60 people out of 3000 is:



    which equals 0.294. So about 70.6% of the time there will be at least one duplicate.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

An investment promises the following cash flow stream: $1,000 at Time 0; $2,000 at th [ 1 Answers ]

An investment promises the following cash flow stream: $1,000 at Time 0; $2,000 at the end of Year 1 (or at T=1); $3,000 at the end of Year 2; and $5,000 at the end of Year 3. At a discount rate of 5%, what is the present value of the cash flow stream?

70% of married couples paid for their honeymoon themselves. You randomly select 20 ma [ 0 Answers ]

70% of married couples paid for their honeymoon themselves. You randomly select 20 married couples and ask each if they paod for their honeymoon themselves. Find the probability that the number of couples who say they paid for their honeymoon themselves is exactly one

Recd 2 bills, each bill rs.20,000/- should I pay Rs. 40,000/- at a time, tds deduct/n [ 1 Answers ]

For a 19,000 gal above ground pool, what type of pump is best [ 1 Answers ]

I have an 18' above ground pool and the pump that came with it just didn't circulate the watervery well. It started OK . Then it started moving the water slower and slower,until it would be on,but didin't move the water at all. It stopped working completely as if the motor had burned up, within a...

How to select an Intermatic Pool Pump Timer? [ 1 Answers ]

I haven't been able to source a distributor or retailer of Intermatic Pool Timer products in Ontario, Canada. I am looking to purchase one over the internet and have it shipped to me and installed by a local qualified electrician, but I don't know which model to purchase. Intermatic has 4...

View more questions Search