Anumber is randomly selected from { 15, 16, 17, 18, 19, 20}.

a is represented by the event that the number picked is less than or equal to 16.

what is the probability of the complement of event a?

a. 1/6
b. 1/3
c. 2/3
d. none of the above

The answer is B. because it says less than or equal to. so that means any number less than the number stated in this case it is 16. any number in the array of numbers less than the selected number or 16 which in this case is 16. :)

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.