Use the following information to answer questions 35-37.
The Dow Jones Industrial Average (DJIA) is an index of stock values. The chart below gives the DJIA closing values from August 24 through September 30 of a certain year and the change in the closing value from the previous day. A minus sign indicates a decline (a closing value less than the previous day's closing value). A plus sign indicates an advance (a closing value greater than the previous day's closing value).
Dow Jones Industrial Average Closing Values
37. What is the average closing value for the 5-day period from September 13 through September 17?