The following are the temperatures in °C for the first 10 days in January:

3.8
,


8.7
,


−
1.5
,


−
8.8
,


0.8
,


−
9.4
,


−
9.2
,


−
5.4
,


−
0.3
,


9.7


Calculate the range.
Give your answer as a decimal.