How Calculated rating are being calculated in Overall Summary?

Summary:

We have 3 section, in first section we have 4 goal and in second section we have one goal, and then comes Overall Summary

Calculation Rules for All section

Section Calculation Rule = Average
Decimal Places = 2
Mapping Method = Nearest
Weightage = Not Enabled

eg:

Section 1
Goal 1- 3
Goal 2- 3
Goal 3- 1
Goal 4- 4

Section 1 Summary : 2.75

Section 2
Goal 1 2
Section 2 Summary : 2

Overall Summary 2.71

How this 2.71 is being calculated

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