Co(CN)3 is Cobalt(III)cyanide or cobalt(III)nitrile.
NB You have written this formula rather poorly.
As given the '3' only represents three nitrogens.
However, when written with brackets as (CN)3 it means that there are three nitrile(cyano) anions present in the molecule.
Co ; 1 x Cobalt
C ; 3 x Carbon
N ; 3 x Nitrogen .
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I think that you have meant Mean, and not Meen. A mean is the average of numbers. For example if you have 2, 3, and 4 The mean of these numbers would be 3.
The mean of the numbers 3 5 7 is 5.
Mean = (88 + 85 + 91)/3 = 264/3 = 88
If, by "3 radical 27" you mean the cuberoot of 27, the answer is YES. If you mean 3 times sqrt(27), the answer is NO.