The arithmetic mean of 2, 5, 5, 1 and 9 is 4.4
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5/9 divided by 1/2 = 5/9 * 2 = 10/9 or 1 1/9
4.5 ÷ 1/5 = 4½ ÷ 1/5 = 9/2 ÷ 1/5 = 9/2 × 5/1 = 45/2 = 22½ = 22.5
I am assuming that you mean (2/(6-1))/9. That would be (2/5)/9, which would be (2/5)*(1/9), which is 2/45. If you mean (2/6)-(1/9), that would simplify to (1/3)-(1/9). That is equivalent to (3/9)-(1/9), so the answer is 2/9.
5/9 + 2/3 = 5/9 +6/9 = 11/9 = 1 2/9
2 over 3 divided by 3 over 5 [2/3] / [3/5] is the same as 2 times 5 over 3 times 3 [2*5] / [3*3] 10/9 1 1/9 1.111... The answer is 1 and 1/9