Exercises

The mean weight of players on a football team is 78 Kg. The weights are:

100, 88, 92, 80, 72, 96, 92, 60, 64, 80, 76, 80, 68, 72, 64, 76, 76, 72, 84, ? , where one number is missing. Find it.
The misssing value is Kg.