Answer:
2 or 3 (depends on your angle)
Step-by-step explanation:
So first calculate the ratio between the grade 9 and the total grades(9/10/11/12).
you calculate ratio by dividing part/whole
part degree for grade 9: 23~27 degrees
whole degree for circle: 360
23~27/360 = 0.0638888889~0.075
Then you multiply the ratio to say to yourself how many of those 36 people are in grade 9.
36*0.0638888889 = 2.3
36*0.075= 2.7
So from our angles about 2.3~2.7 of the total 36 students are in grade 9.
Because you can't have partial people(only integers) the answer would be 2 or 3 depending on the angle.
Think of this like this
The area of the above circle is 36? what's the area under grade 9?
You would multiply circle by ratio or divide circle by the fraction.
Pie chart's just representing the ratio of the whole vs part.!
