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Question

1) Suppose a student earns a 100 on Test I, misses Test II, makes 80 on Test III, 70 on Test IV, and 85 on the Final. What is student's course average rounded to the nearest tenth?

2) Suppose a student earns a 100 on Test I, 90 Test II, and 65 on Test III. what is student's course average at that point in the course rounded to the nearest tenth?

                       Test I                                 10%                     

                             Test II                                 15%                     

                             Test III                              15%                     

                             Test IV                               20%

                             Final Exam                        40%  

Answer 1

Answer 2

1)To calculate an average, you want to sum up the values and divide by the total number of values.

There are 5 tests total, we say the second test score is 0 since it is missed.

So the average is: (100+0+80+70+85)/5=67.0

2) Since the student has only taken three tests by now, we divide by 3 instead of 5.

So the average is: (100+90+65)/3=85.0

We add the .0 in 67.0 and 85.0 to show the nearest tenth (the number are integers so no rounding is necessary).