Concept Quizzes

Mean
Mode
Median
Range
Interquartile Range
Variance
Correlation
Problem Solving - Basic
Effects of Changes to Data
Advanced Data Transformations

Challenge Quizzes

Level 2

Understanding Data: Level 2 Challenges

What is wrong with this news coverage?

A country's independence should not be based on polls The percentages should add up to 100% Live polling is unreliable There is nothing wrong with the news coverage

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by Chung Kevin

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The average age of the family (father, mother, and several children) is 18. If the father, who is 38 years old, is not included, then the (new) average would be 14. Find the number of children in the family.

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by Timothy Wong

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There are eight people in a family. One of the members receives \(x\) presents. Five members receive \(x+4\) each and the rest only get \(x-2\) each.

Consider the 8 numbers of presents received, and find \[2 \times \mathrm{mode} - \mathrm{mean} - \mathrm{median}.\]

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by Michael Ng

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The sum of \(N\) real numbers (not necessarily unique) is 20. The sum of the 3 smallest of these numbers is 5. The sum of the 3 largest is 7. Which of the following are possible values for \(N\)?

I. 9
II. 10
III. 11

I, II, and III II only I and II only II and III only

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by Calvin Lin

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The value of \(x\) is the mean of the numbers in the white circles. The values of \(y\) is the mean of numbers in the blue circles.

Find \(x-y\).

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by Victor Paes Plinio

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Waste less time on Facebook — follow Brilliant.

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Understanding Data

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Concept Quizzes

Challenge Quizzes

Understanding Data: Level 2 Challenges

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Excel in math and science

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Excel in math and science

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Excel in math and science

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Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

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Master advanced concepts through explanations,
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Learn from a vibrant community of students and enthusiasts,
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Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.