Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Just what is Yahoo! Insider trying to tell me?

When I open Yahoo! Messenger, it automatically opens Yahoo! Insider (guess that name comes from being inside of Messenger!?). This morning it told me "About 10 million people share your birthday.".

My real question is: Is that estimate based on my specific birthdate, or is it an average based on the total World population divided by the days of a year?

Update:

Thanks for the answers so far: I realize "they" couldn't tell how many times you blink (yet!? ;-) ), and I thought of that when posting this, but they might be able to do some kind of estimate of how many people were born on the same day as each of us (I could - complicated/complex as that might prove to be, and as unlikely as it seems they would do).

Proof of the "average" theory would be if the population of the world is 3,650,000,000 (or there-abouts). I just looked it up and it is approaching 7,000,000,000 - so?

Update 2:

Just looked up the population of China - estimate just under 1,345,000. It is almost enough to take up half of the difference - if they did inexplicably overlook that "bit" of population. If so, still call it roughly 2,000,000 off - about 1/3. Seems like that would make it a rather overly rough or ancient estimate.

re: the X's and Y's - are you talking capitals or lower case and what size font? ;-)

Update 3:

correction: ^ scratch the "X's" part of that - "Y's" still apply ^

. . . and an FYI: I found a seemingly reliable source that showed the total world population reaching/passing the 3.65 billion point in 1970. Quite a bit earlier than would seem acceptable for an error that large by Y!IM. http://www.worldometers.info/world-population/

Update 4:

Alright: I would choose a BA, but the primary motivation for the posting of this Q was to see if the Asker still gets 3 points returned when BA is chosen by vote. So am now waiting to see . . .

3 Answers

Relevance
  • 9 years ago
    Favorite Answer

    I cant tell you the exact figures like insider does bit there is a principle called the Birthday Parradox and is usefull in several different areas (for example, cryptography and hashing algorithms). Try it yourself -- the next time you are at a gathering of 20 or 30 people, ask everyone for their birth date. It is likely that two people in the group will have the same birthday. It always surprises people!

    The reason this is so surprising is because we are used to comparing our particular birthdays with others. For example, if you meet someone randomly and ask him what his birthday is, the chance of the two of you having the same birthday is only 1/365 (0.27%). In other words, the probability of any two individuals having the same birthday is extremely low. Even if you ask 20 people, the probability is still low -- less than 5%. So we feel like it is very rare to meet anyone with the same birthday as our own.

    When you put 20 people in a room, however, the thing that changes is the fact that each of the 20 people is now asking each of the other 19 people about their birthdays. Each individual person only has a small (less than 5%) chance of success, but each person is trying it 19 times. That increases the probability dramatically.

  • 9 years ago

    They are just trying to flatter you. Saying you're "one in a million" ten times over ;)

    I am quite sure Yahoo does not have a department that goes around recording birthdays for the whole world, so I'd say they're just guessing, confident that you'll never be able to disprove them.

    @first answerer -- put a piece of foil over the webcam on your lappie, to be on the safe side.

    Re add details: either they're not counting China (not fair, they have birthdays too) or the quote is many many years out of date and they've not bothered updating it. The latter more likely. So don't take their word for the blinking, eating and days spent shaving, either.

    IF they say anything about X number of Y's laid end to end would go to the moon and back Z times, you can believe those, as the moon only goes a teeeeny bit further from us each year. They measure it by bouncing lasers off special reflectors left there I think on the last manned mission there.

  • Vicky
    Lv 7
    9 years ago

    I think it's just a statistic based on averages.

    It also has told me :

    How many times I blink and they cant possibly KNOW that I blink more than most people..

    I bat my eyelashes an flirt a lot.

    :)

    And they cant really know how much time I spend eating or sleeping.... at least I *hope* they aren't watching me!!!!

Still have questions? Get your answers by asking now.