Understanding Data

Understanding Data: Level 2 Challenges


What is wrong with this news coverage?

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.

There are eight people in a family. One of the members receives xx presents. Five members receive x+4x+4 each and the rest only get x2x-2 each.

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

The sum of NN 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 NN?

I. 9
II. 10
III. 11

The value of xx is the mean of the numbers in the white circles. The values of yy is the mean of numbers in the blue circles.

Find xyx-y.


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