TMUA 2018 Paper 1 Q17 — Worked Solution

P1·Statistics & Probability·6.0Official · 2018 · Q17

weighted-meanset-exchangesystem-of-linear-equations

There are two sets of data: the mean of the first set is

15

, and the mean of the second set is

20

.One of the pieces of data from the first set is exchanged with one of the pieces of data from the second set. As a result, the mean of the first set of data increases from

15

16

, and the mean of the second set of data decreases from

20

17

.What is the mean of the set made by combining all the data?

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TMUA 2018 Paper 1 Question 17

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