Two statisticians are out hunting when one of them sees a duck.
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And you probably already intuitively knew that an average is just a number that represents the different values that a group could have. And we can kind of view this, 7.25, as one way to represent these four numbers without having to list these four numbers. We just figured out the average of the first four exams. We add what I got on the fifth exam, and then we divide it by 5, because now we're averaging five exams.
But it can represent that as one number as opposed to giving all the different values. There are other representations you'll learn later on. You'll also the mean, which we'll talk about later, is actually the same thing as the average. And I said that I need to get in an 88 in the class.
In very general terms, it's getting your head around data. This is when you use data to essentially make conclusions about things.
And it can broadly be classified into maybe three categories. So let's say you've sampled some data from a population, and we'll talk a lot about samples versus populations, but I think just a basic sense of what that is.
$$1,2,3,,5,6,7$$ If we have a set of data with an even number of data points, then the median is the mean of the two data points in the middle $$1,2,3,,6,7,8$$ $$\frac=\frac=$$ The mode is the most common number in the set of data.
There are several statistical quantities called means, e.g., harmonic mean, geometric mean, arithmetic-geometric mean, and root-mean-square.
Mean, median and mode are numbers that represent a whole set of data or information.
Mean, median and mode are together called the measures of central tendency. To find the mean you take a set of data and calculate the sum of the data, after that you divide the sum by the number of pieces in the set.
Because I only have two exams left, even if I were to get 100 on the next two exams. Hopefully, I think some of this might have been a little bit of a review for you.
6 minus is 20 6 goes into-- so we'll see it's actually 89.333333, goes on forever. So no matter how hard I try in this class, the best I can do.