What is the median of the data set?
{16, 15, 17, 19, 12, 11, 14, 14, 13, 11, 18, 15}

11, 11, 12, 13, 14, 14, 15, 15, 16, 17, 18, 19.
14 + 15 = 29/ 2 =14.5

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.