How do you compute averges in your head?

[Colt45]

sum them, divide by amount of numbers summed... the only way

 

[Alone]

Originally posted by: gwlam12

Originally posted by: Alone
Add them together and divide by two.

The average of 4, 5, and 6 is not 7.5.

The OP's example assumes two numbers, not three.

If there are 3 numbers, I'll add them together and divide by 3, obviously.

 

[JJChicken]

Originally posted by: Alone
Add them together and divide by two.

QFT

 

[IHateMyJob2004]

Originally posted by: Leros
I usually find the difference between the two numbers, divide by two, and add it to the smaller number.

I just ball park it in my head.