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TSA 2014 · Question 42 · Optimisation

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The table below shows the mean maximum daily temperature for Oxford for each year from 1905 to 1920 along with a moving 5-year average (the value shown beside 1920 is the average from 1916 to 1920 inclusive). Three values are missing from the table.

Question diagram

What value should be in the position marked 'y'?