There is no single answer to the question. Numbers in dreams refer to something in that specific dreamer's life, such as an address, significant date or a fragment of a phone number. Generally they have disappointingly mundane meanings.
Dream On - 1990 Music in My Veins Part II 6-9 was released on: USA: 20 September 1995
It doesn't really mean anything it came to John in a dream.
The American Experience - 1988 Big Dream Small Screen 9-6 was released on: USA: 10 February 1997
Dream On - 1990 Significant Author 6-4 was released on: USA: 9 August 1995
Sum = 42 Count = 6 Mean = Sum/Count = 42/6 = 7
Numbers do not have specific universal meanings in dreams. In other words, the number 9 in your dream could refer to an anniversary or address or the date of an appointment, while in another person's dream, the same number would mean something entirely different.
If you mean 6 2/9, then it's (6 * 9 + 2) / 9 or 56 / 9
(5 + 6 + 6 + 9) = 26/4 = 6.5. The mean of the four numbers is therefore 6.5.
The mean is the average = (6+9+101+4)/4 = 30
'Mean' is the average of a range. (6+9+7+3+10+9)÷6=7.333333333 (7.33 to two decimal points).
GM(6, 9) = sqrt(6*9) = sqrt(54) = 7.3485 approx.
do you mean what is 3+6+9-12? The answer is 6: 3+6=9 9+9=18 18-12=6 :)