Alan and debra want to find the mean number of movies students in their class

Step-by-step explanation:

well if alan and debra are in separate class rooms.  They would have to add up the number of movie students in each class room   alan has X movie students and debra has Y movie students

Mean number  =  Average number  =   sum of the values / number of values

Mean number =  (X + Y) / 2

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

12/11c

or

12

c

11