Question 1
The spinner that Philippe could make would have 2 sections, one for rain and one for no rain. The rain section would take up $20\%$ of the spinner and the no rain section would take up $80\%$. To perform the simulation, Philippe would spin the spinner 10 times and record the outcomes of each spin. He would then compare the number of times it landed on rain to the number of times it landed on no rain to estimate the probability.
Question 2
Philippe's estimated probability from his simulation is $4$ outcomes out of $10$ trials, which is $40\%$. The theoretical probability of it raining tomorrow is $20\%$. Philippe's estimated probability is not representative of the theoretical probability because it is higher than the actual probability. This could be due to chance or error in the simulation process.