grade from outcomes

I want to develop a plugin ...

Well, I want to have multiple graders in my system.

So, for an assignment grading, I use outcomes

I define outcomes name them outcome1, outcome2, outcome3 etc. corresponding to a rating scale (ten-point, twenty ... accordingly). Raters, after login, put in moodle and submit their score on each question. Then I set out to the degree course as the sum of the average operations including.

I want to get the final grade of each lesson 

Wwhat is the correct php syntax of a command that gives me the score of work based on average outcomes using moodle databases?

Can someone give me an answer?