No score occurs more than once, so there is no mode for this data set. In this set, the middle value lies between 44 and 39, so add these middle numbers together and divide by 2. The mean is 42.25.įirst put the scores in order, then find the middle value. StatĪdd all the scores and divide by 8, the number of contestants. ![]() Now, let's find the three averages and the range for the contestants' scores. Here are the contestants' scores on this week's episode of our favorite show, Prancing with the B-List Celebrities: Evan L This Week on Prancing with the B-List Celebrities Both the mean and median for the girls was significantly higher. Time Spent Social NetworkingĪs we predicted, on average girls spend at least one hour a day more on these sites than boys. For our social networking survey, we found the mean, median, and range for the amount of time each group spends on social networking sites per day. This will all make a lot more sense with some real examples. To find the range, subtract the smallest value in the dataset from the largest. The range measures the "spread" of the data, how far apart the smallest and largest values are. The range is NOT a measure of the average however, it is often taught along with averages because it's another helpful way to measure a set of data. There can be more than one mode or none at all.įinally, there is the range. To find the mode, just look for the number that occurs the most. ![]() The mode is probably the least common way of finding the average, and in most cases is the least useful. If the middle number lies between two numbers, find the mean of those two numbers (add them together and divide by 2). However, the data must be in numerical order (least to greatest or greatest to least) before finding this average. The median is the middle number in a data set. Finding the mean is simple: just add up all the numbers in a data set and divide by the number of data entries. (In fact, in everyday language, people often use the word "average" simply to mean, um, "mean"). The mean is the most commonly used measure of finding the average. Each will give you a different way of looking at the numbers depending on the question you're trying to answer (or the argument you're trying to make), any of the three could prove the most useful. There are three ways to measure the average: the mean, median, and mode. finding where the middle of the data lies. The most commonly used statistic is the average, a.k.a.
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