You can obtain information about the mean population by taking a random sample of it and taking the average of that sample. The Law of big Numbers says that the bigger the sample, the more likely we will be closer to the real mean value. In other words, the margin of error is less likely to be big.
We know that the initial temperature is -3 then it rises to 8 and drops by 6 degrees then you just need to subtract six from 8 
Can you add additional information about the problem?
Answer:
-8+12=4 is the correct answer
Thank you
123 rounded to the nearest hundred is 100 i believe