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In mathematics, the moments of a function are quantitative measures related to the shape of the function's graph. If the function represents mass, then the first moment is the center of the mass, and the second moment is the rotational inertia. If the function is a probability distribution, then the first moment is the expected value, the second central moment is the variance, the third standardized moment is the skewness, and the fourth standardized moment is the kurtosis. The mathematical concept is closely related to the concept of moment in physics.
For a distribution of mass or probability on a bounded interval, the collection of all the moments (of all orders, from 0 to ∞) uniquely determines the distribution (Hausdorff moment problem). The same is not true on unbounded intervals (Hamburger moment problem).
In the mid-nineteenth century, Pafnuty Chebyshev became the first person to think systematically in terms of the moments of random variables.

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  1. S

    Head scratching moment.

    Hi all, On my current job (plumbing ,CH/HW) for a loft conversion on a first floor maisonette. I was planning on adding a water accumalator to improve pressure and flow rate. which is looking like a no go due to cost. I think the route we are going to take is to increase the water main size...
  2. hammers4spanner

    That moment when ...

    You drive into a multi story car park in a van and forget you have a roof rack CRUNCH !!!! Silly me:75:
  3. turnpin

    How's the scrap price at the moment...

    As the title......good or bad regards Turnpin:biggrin:
  4. jaydebruyne

    A rare moment

    Its not often I have a bout of confidence, and when I do its very short lived. But I did another boiler install today, my 3rd gas boiler... Had to run a vertical flue up through the ceiling and 90 to an outside wall. Took off a Baxi and fitted a Worcester greenstar 24i system boiler. I know...
  5. Riley

    Having a moment...

    Full of cold and head is not functioning. Whats the minimum fall on 2in waste pipe??
  6. AlexGas

    Watch moment apprentice plumber realises he's made a rather crucial mistake...

    Watch moment apprentice plumber realises he's made a rather crucial mistake installing his first toilet - Mirror Online
  7. R

    An awkward moment..

    Finishing off a full heating today. The builder arrived to do making good and airing cupboard shelves. As he greets the tenant he says nice and loudly "when's the baby due then?!".... Stunned silence. She's not pregnant just a bit chunky! she went mental! Threw him out and then proceeded to cry...
  8. M

    Proper panic moment...

    Thought I'd lost nearly a grand cash today. Proper sick feeling in the pit of my stomach. Horrible, horrible feeling... But I've eaten now, and calmed down a bit...
  9. J

    Auto air vent placement

    If anyone can give me pointers I'd be most grateful. I have flow and return coming in at the floor level in one corner of a room that rises to ceiling level runs around three walls and drops to the ufh manifold. It is drained at the moment but when I refill Id like to have done the most I can...
  10. R

    eyebrow lifting moment!!

    customer called me to pop around last thing today as he has pulled off the control knob to his gas fire. easy type of fix as the cotter-pin had snapped and rod fell off underneath. i was trying to fix it from under the fire but access was difficult. anyway, customers going on about it being 25...
  11. B

    Take a moment please for

    All those on call we won't mention any names but croppie I realy realy want you to know I'm on my 6th beer and don't see any sign of stopping
  12. Super Mario

    Best combi drill at the moment?

    Im llooking for a new combi drill for around £150 what is the best at the moment?
  13. W

    My favourite youtube moment of 2013.Enjoy.

    Duracell Bunny Keeps On Running Duracell Bunny Keeps On Running - YouTube
  14. M

    Had a thick moment today, but also a question to ask.

    So my Danesmoor had couple of lockouts on Friday and the same Saturday morning so thought I would do quick investigation (lockouts occuring on startup). Checked filter bowls for debris or signs of water, both clean and good oil flow. Reset lockout and tried restart. Nothing, no motor run just...
  15. Z

    A very proud moment

    I completed my first 10k or 6 miles (well 5.89) tonight! I'm celebrating with a bottle of red!
  16. A

    Condenste Pump Glowworm Flexicom 30cx replacement

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  17. V

    The moment of truth :-)

    So far I've gone 71 days without a *** and for the last week or so I've not even been using my electric cigarette (well maybe once or twice) but I'm going out on the lash in a bit and its the first time I've been "out propa" since I've quit. If I can do tonight without a *** then I reckon I'll...
  18. G

    Embarrassing Moment Thread

    Here's mine. Was in Screwfix for some decorators filler and it was extremely busy. I placed the order for 5 tubes and the lassie behind the counter shouted into the warehouse, "Mr Moore is looking for some caulk". The whole of Screwfix turned round to me and p issed themselves laughing...
  19. J

    Need some info please.

    Hey people. Just wondering about what my options are when it comes to training up as a plumber. I'm currently on the city & guilds level 2 plumbing studies course (6035) I'm actually loving the course, got a passion for the trade and really want to acheive the highest I can acheive doing it...
  20. R

    its an eureka moment!

    i have finally found what the 900mm flexy's are for!!!!:rofl:
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