The following temperature deviations (in °C) from the normal were recorded for a town during a 12-day period:
2.5, −1, 3, 0.5, −2, 4, 1.5, −0.5, 2, −1.5, 3.5, 0
Use this information to answer the questions below.
a. (i) Arrange the deviations in ascending order.
b. (ii) Calculate the arithmetic mean of the deviations, correct to one decimal place.