Learn how to calculate the mean by walking through some basic examples & trying practice problems.

The mean absolute deviation (MAD) is the mean (average) distance between each data value and the mean of the data set. It can be used to quantify the spread in the data set and also be helpful in …

And so, with only the real numbers, we can't solve x 2 = 1 . We need the imaginary numbers for this! As you continue to study mathematics, you will begin to see the importance of these numbers.

There is no video. A congruent B (modulo C). Does this mean that when A or B is divided by C the remainder will be the same?

Yup! In math, log usually means base 10, as that is the base system we normally use. ln is another button you'd find on a scientific calculator, which means natural logarithm, or log base e (2.71828...). …

This is the definition of "i", and it leads to all sorts of interesting things. Now some places you will see "i" defined this way; "i" as being equal to the principle square root of negative one.

When you have a missing piece in your math problem like that, you can put a letter in it to help. Once you get the answer though, make sure to get rid of the letter unless it’s needed for the problem.

. Mean: The mean is just another word for the average. To find the mean of a set of numbers, you add up all the numbers and then divide by how many numbers there are. Here's how you do it: Add up all …

The distributive property tells us how to solve expressions in the form of a (b + c). The distributive property is sometimes called the distributive law of multiplication and division.

It's a way of measuring the variation in the data. Suppose we calculate the IQR for the scores on one math test. Class A has an IQR of 8, while Class B has an IQR of 48. That means the middle 50% of …