PLEASE HELP ASA Please tell me what to do to answer the question after the chart...

Write a mathematical expression using the information from your table to answer the following questions:

What is the mean change in the forecasted high temperatures over the next 7 days? Remember, this can be found by averaging the values in the Difference column for the high temperatures. Show your work and steps. If your answer is not an integer, explain what two integers your answer is between.

I'm an FLVS student and had this assignment last year. I attached screenshots of my paper so you can see how to answer the questions. Please just dont copy my work word-for-word; you'll get flagged for plagerism by TurnItIn. Just apply the same methods to your own data.

1.    What is the mean change in the forecasted high temperatures over the next 7 days? Remember, this can be found by averaging the values in the Difference column for the high temperatures. Show your work and steps. If your answer is not an integer, explain what two integers your answer is between.

Add all the diffrences in high temperature: 0 + 1 + (-2) + 0 + (-5) + 0 = (-6). Then divide the answer, negative six, by the number of days, six: (-6) ÷ 6 = (-1). This shows that the mean change in forecasted high temperature is (-1).

2.   What is the mean change in the forecasted low temperatures over the next 7 days? Remember, this can be found by averaging the values in the Difference column for the low temperatures. If your answer is not an integer, explain what two integers your answer is between.

Add all the diffrences in low temperature: (-1) + 1 + 0 + 0 + (-7) + (-2) = (-9). Then divide the answer, negative nine, by the number of days, six: (-9) ÷ 6 = (-1.5). Because this answer is not an interger, we will represent the mean by the two interegers it is between. The mean change in forecasted low temperature is between (-2) and (-1).

what is the original number? you forgot to add it.