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Math Help - Desparet for HELP! Calculate average stay!

  1. #1
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    Aug 2008
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    Desparet for HELP! Calculate average stay!

    Hi guys!

    I've been trying to figure out this math problem forever! I was hoping you could help out? =)

    Month 1
    - 100 sign-ups

    Month 2
    - 100 sign-ups
    - 80 left from month 1

    Month 3
    - 100 sign-ups
    - 80 left from month 2
    - 40 left from month 1

    Month 4
    - 100 sign-ups
    - 80 left from month 3
    - 40 left from month 2
    - 2 left from month 1

    Average stay?

    Thanks,
    magnus
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  2. #2
    MHF Contributor Quick's Avatar
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    May 2006
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    New England
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    Are these the right numbers, because if they are than that means that 122 left from month 1 but only 100 people were signed up
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  3. #3
    Newbie
    Joined
    Aug 2008
    Posts
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    sorry - my bad

    Sorry, but I think I was a bit unclear with what I meant. This is how it should look:

    Month 1
    100 new sign-ups

    Month 2
    100 new sign-ups
    80 of the sign-ups from month 1 is still "in the game"

    Month 3
    100 new sign-ups
    80 of the sign-ups from month 2 is still in the game
    40 out of the sign-ups from month 1 is still "in the game"

    Month 4
    100 new sign-ups
    80 of the sign-ups from month 3 is still in the game
    40 of the sign-ups from month 2 is still in the game
    2 of the sign-ups from month 1 is still in the game

    What is the average stay?
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