The answer is 0.3 To get their mean, add them up and divide by seven (the number of days).
Here is how the mean changed every day: 0.1 Current mean = 0.1 0.3 Current mean = 0.2 0.0 Current mean = 0.13333333333333333 1.1 Current mean = 0.375 0.4 Current mean = 0.38 0.0 Current mean = 0.31666666666666665 0.2 Current mean = 0.3