Do you want the total or the average to be 80 (in the equation you have shown
the total as 80)?

By the very nature of this problem, only 9 of those 10 numbers can be truly
random (the 10th is constrained by the fact that the average of the 10
numbers has got to be 80).
Generate 9 random numbers between 50 and 100, using =(rand()+1)*50, say in
A1 thru A9. The 10th number (A10) is =800-sum(A1:A9). Due to the random
nature of the first 9 numbers, the 10th may not necessarily fall in the
required range, 50-100; hit F9 repeatedly till the 10th number also falls in
that range (this may need several attempts).

B.R.Ramachandran

"Daniel Lugones" wrote:

I have a number, lets say 80. I want to find other values, lets say 10 number
values, between 50 and 100 such as that those numbers added have an average
of 80.

In other words:

a + b + c + d + e + f + g +... = 80
How can I find random values between 50 and 100 (a, b, c, d, etc) whose
average is 80.
Is it possible in Excel 2000?
thank you.
Daniel Lugones