What is the average of 90, 100, 90, 65, 80, and 73.

If you want to find the mean:  add all the numbers and divide by the number of numbers.

If you want to find the median:  arrange them from smallest to largest and choose the middle number (in this case, since there are an even number of numbers, choose the number halfway between the two middle numbers).

If you want to find the mode:  choose the number that is used most often.

The answer to your question is: What is life? That is my answer.