The equation for the reaction is:

C6H8O7 + 3 NaOH - C6H5O7Na3 + 3 H₂O

The concentration of the sodium hydroxide was 0.102 mol/dm³
Concordant results are those within 0.10 cm³ of each other.

Calculate the concentration of the citric acid in mol/dm³
Use only the concordant results from the table in your calculation.
You must show your working.