How do you calculate a two point estimates of the average grade for the whole course using two different ways.

the tutorial - 19 students in the class, 520 students in the course. 189 students overall work and study. while only 8 students work and study in the tutorial. 1 - working, 0 is not working and the numbers are the grades recieved for the tutorial.

0 89 1 72 1 65 1 72 0 70 0 69 0 45 1 68 0 87 0 34 0 84 0 60 1 78 0 65 0 63 1 58 1 86 0 74 0 52 1 54

Explain if you expect the two estimates to be the same. - what would this require?