It is: 9 because IX means 10-1 = 9
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They are the Roman numerals for 9, 10, 16 and 17.
IX (9) + XV (15) + XX (20) = XLIV (44)
36
Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger one. → IX = (-1 + 10) = 9.
You incorporate the fractional remainder into the mean. The mean does not have to be a whole number.