2 In 1856 Andrew Waugh announced Mount Everest to be 8840 m high after several years of calculations based on observations made by the Great Trigonometric Survey More recent surveys confirm the height as 8848 m Calculate the percentage error made in the earlier survey 4 The temperature today in Chicago is 50 F Instead of using the standard conversion 5 formula C x F 32 Tommaso uses his grandmother s rule which is easier but gives an approximate value Subtract 32 from the value in F and multiply the result by 0 5