Standard Deviation and Variance. Deviation just means how far from the normal Standard Deviation The Standard Deviation is a measure of how spread out numbers are.
Its symbol is σ (the greek letter sigma) The formula is easy: it is the square root of the Variance. So now you ask, "What is the Variance? " Variance The Variance is defined as: The average of the squared differences from the Mean. To calculate the variance follow these steps: Work out the Mean (the simple average of the numbers)Then for each number: subtract the Mean and square the result (the squared difference).Then work out the average of those squared differences. Example You and your friends have just measured the heights of your dogs (in millimeters): The heights (at the shoulders) are: 600mm, 470mm, 170mm, 430mm and 300mm. Find out the Mean, the Variance, and the Standard Deviation.
Your first step is to find the Mean: Answer: Mean = 600 + 470 + 170 + 430 + 3005 = 19705 = 394 so the mean (average) height is 394 mm. So the Variance is 21,704. Math Central - Welcome! ‘Just Look Up’ at Festival of Imagination, Selfridges, London. Opening nature's bounty. 650 Free Online Courses from Top Universities. Advertisment Take online courses from the world’s top universities for free.
Below, you will find 1,700 free online courses from universities like Yale, MIT, Harvard, Oxford and more. Our site also features collections of Online Certificate Programs and Online Degree & Mini-Degree Programs. Note: This page includes a lot of Massive Open Online Courses (MOOCs). If you want to enroll in a free version of a MOOC, please select the “Full Course, No Certificate” (edX) or “Audit” (Coursera) option. Humanities & Social Sciences Art & Art History Courses Classics Courses Communication Courses Economics & Finance Courses Bookmark our collection of free online courses in Economics. Education Courses Food Courses Geography Courses Health Courses. Audio Books, Podcasts, Videos, and Free Downloads to Learn From. Anki - friendly, intelligent flashcards.
E-books. Www.acceleratedlearning.co.uk. Colin Rose's Accelerated Learning. Touch Typing Lessons. Open University. Copyrighted image Credit: The Open University Open2.net fades away...
For ten years, give or take, Open2.net was the online home of Open University and BBC programming. Over the last few months, though, we've been moving into OpenLearn, creating one home for all The Open University's free learning content. It means we share a home with the Open University's iTunesU and YouTube channels, and much more besides. You can use the navigation at the top of this page to explore what we have on offer. There's lots to do - you could watch Evan Davis exploring the state of British manufacturing7; explore the frozen planet8; get to know the science and history of the Olympics9 or have a look at our free courses.
Most of the content from Open2.net has been brought across; if you've landed here after typing or searching for an Open2.net URL then you're probably looking for something that fitted into one of these categories: Open2 forums We still want you to join in, comment and share your views.