Four temperature readings are -3, 0, 2 and 6 degrees Celsius. What is the range of these readings? Enter the number of degrees Celsius.

توضیح

The highest reading is 6 degrees and the lowest is -3 degrees, so the range spans from -3 up to 6, which is 9 degrees. Dropping the minus sign and working out 6 - 3 gives 3 and understates the spread, because a reading below zero sits further from 6 than a reading of 3 above zero does.