What is the average teperater of mercury?
The temperature is ranges from -183C to 427C
Vague question, grossly underspecified. The answer will depend on whether the question is about the size of the planet Mercury; the (average/nearest/furthest) distance of Mercury from the Sun; the (average/nearest/furthest) distance of Mercury from the Earth; or the question could refer to Freddie Mercury (of Queen).
Both Mercury and Earth are orbiting the Sun. At some time they are on the same side of the sun and at others they are on opposite sides of the Sun. Thus the concept of an average distance between them is almost meaningless as it is constantly changing. The average distance of Mercury from the Sun is 57,909,100 km. The average distance of Earth from the Sun is 149,597,887 km.