T-value for different classes

T_Value.xlsx

I want to see which are the 3 top labels with the highest T-value for each class.

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Avg1 is the average for one class across the label sample and Avg2 is the average for the other classes.

Stdev1 is the standard deviation for one class and Stdev2 is the standard deviation for the other classes.

How would I calculate the Average1 of a whole class?
And how would I generate a T-value for each label? It seems this formula would only give me a T-value per class.

labels are a,b,c,d,e,f,g that you can see on the attached file.