As stated in question number 1 to calculate mean median mode using spss with data set 3. I could not find the data set 3.
My own opinion as regards your question, Exercise 7; you have to use the data in Exercise 5 read from number three (3) and 4 of Exercise 5 and use the data provided to give your response to question 1 to3 of Exercise 7. This is my view. Let us wait till next week after Lara Lectures