tmua.me Medium Set C Paper 2 · Question 18

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tmua.me Medium Set C Paper 2 · Q18

Paper 2Statistics

A non-empty list of real numbers is used to form two new lists.

In the first new list, each number $x$ is replaced by $(x-2)^2$ . In the second new list, each original number $x$ is replaced by $(x-6)^2$ .

The means of the two new lists are $13$ and $5$ respectively.

What is the mean of the original list?

3

4

5

6

8

9

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