Calculating the mean There are many different types of mean, but usually when people say mean, they are talking about the arithmetic mean. The arithmetic mean is the sum of all of the data …

Learn how to calculate the mean by walking through some basic examples & trying practice problems. The mean is used to summarize a data set. It is a measure of the center of a data …

Learn how we define the derivative using limits. Learn about a bunch of very useful rules (like the power, product, and quotient rules) that help us find derivatives quickly.

The derivative of a function describes the function's instantaneous rate of change at a certain point - it gives us the slope of the line tangent to the function's graph at that point. See how we …

The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered …

Not here, no. If you're working with computer representations of matrices, it's often easiest to 0-index. But in pure math, we start counting at 1.

Well, that cannot be helped. Just having the device to watch the videos, to be able to swipe and click on the device, and to be able to see, requires a lot of math to do so already.

Well, we can also define it, especially something like an arithmetic sequence, we can also define it recursively. And I want to be clear-- not every sequence can be defined as either an explicit …

6x + 5x = 11x 2 and 8 doesn't have x. So we can combine them. 2 + 8 = 10 Thus 6x + 5x + 2 + 8 = 11x + 10 Check this out for a clearer explanation: https://www.khanacademy.org/math/cc …

If you want to remove the outliers then could employ a trimmed mean, which would be more fair, as it would remove numbers on both sides.