IXL | Interpret mean and mean absolute deviation

Britney is taking a beginner coding class online. After each lesson, she completes a project. Britney can score up to 25 points on each project. So far, she has completed 9 projects and scored at least 10 points on each. Her mean score is about 19.1 points, and the mean absolute deviation is about 3.7 points. After Britney completes 1 more project, she can move on to the intermediate class.

Which is a measure of how much Britney's scores have typically varied?

1 point

3.7 points

10 points

19.1 points

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Learn with an example

question

The Anderson family is playing a word game. Players score points for using their letter tiles to spell words, with long words and words with uncommon letters scoring more points. Each of the 5 players has had 3 turns so far. The players' mean score per turn is 14.4 points, and the mean absolute deviation is 8 points. Melissa, who is only 12 years old, has scored the most points.

Which is a measure of how much the players' scores per turn have typically varied?

3 points

5 points

8 points

14.4 points

key idea

The mean is the average value of the data set. It describes the center of the data set.

The mean absolute deviation (MAD) is the average distance between the data values and the mean. It describes the variability of the data set.

solution

You want to describe how much the players' scores per turn have typically varied.

Use the mean absolute deviation, since it describes the variability of the data set. The MAD is 8 points.

So, the players' scores per turn have typically varied by 8

points.

Looking for more? Try these:

Lesson: Mean, median, mode, and range

Lesson: Mean absolute deviation

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OO.2Find the mean

JJ.6Calculate mean absolute deviation

Lesson: Mean, median, mode, and range

Lesson: Mean absolute deviation

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