Standard deviation khan academy10/10/2023 For longer lists, a quick way to find the middle number is to divide the total number of items in the set by 2 and round up. If you have an even number, the median is the average of the two numbers in the middle. If your list has an odd number of values, the median is the number right in the middle. Once that's done, here's a straightforward way to find the median. It might not be, especially if the values are coming from a chart, graph or table, so order the list by rewriting it before doing anything else. The first step in finding the median in a list of numbers is to make sure the data is in sequential order. ![]() When a question involves the mean/average, write down T = AN, fill in what you know, and solve for what you need. On the ACT, however, you might be asked to find a different value, so memorize the TAN equation: Total = Average x Number of Things. That's taking the total (sum) and dividing by the number of things to find the mean. When you add up your separate ACT test scores and divide by four to find your composite ACT score, well, that's also the mean - if you know what we mean. ![]() When you figure out your GPA, gas mileage or free-throw percentage, you're finding the mean. Let's start with the mean, which you may more familiarly think of as the average. The most confusing thing about them tends to be that they all sound similar because they're short M words in actuality, you likely already interact with most of them without even realizing it. Mean, median and mode are frequently discussed in tandem because they all describe central positions within a dataset. ACT Stats: Brought to You by the Letter M
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