Answer:
Average daily temperature in May is 11.9°C
Step-by-step explanation:
We are given the function for the average daily temperature as,
.
Since, x = 0 corresponds the month January.
Then, May is represented by x = 4.
Substituting x= 4 in the given function, we get,

i.e. 
i.e. 
i.e. 
i.e. 
i.e. f(4) = 11.9°C
Thus, the average daily temperature in May is 11.9°C