Avarage review formula

Dear Sirs,

I do not understand your score avarage calculation. I got from my last Italian guest all 10, except value (7,5) and his avarage score is calculated by you 9 which is not true. The correct average calculation is 9,6 and not 9.

Please note that this incorrect score negatively impacts on my final score! 

Also, I have been scored from my other guests with all 10 points and you have calculated final guest score with 8?! Please find attached printscGuest scorereen. 

Please make the correction.

Thanks with best regards,