8.5
There are infinitely many numbers between 8 and 9. For example, 8.00000000001 8.000000000011 8.000000000012 8.000000000012000000000001 8.0000000000120000000000011 and so on.
9 and 10
8, 9, 11 and 12
The numbers are -10, -9, -8 and -7.
There are four: 4, 6, 8 and 9
The numbers between 8 and 10, not including 8 and 10 is 9.
8.5
Four numbers 6, 8, 9, 10
They are 4, 6, 8 and 9.
There are infinitely many numbers between 8 and 9. For example, 8.00000000001 8.000000000011 8.000000000012 8.000000000012000000000001 8.0000000000120000000000011 and so on.
Add up all the numbers and then divide by how many numbers there are... *Example* -8, -1, 9, 16 -8 + -1= -9+9= 0+ 16=16 16 divided by four(there are four numbers) THe mean is 4!
4, 6, 8, 9, 10
9 and 10
10
8 numbers
8, 9, 11 and 12