Is the data set approximately periodic? If so, what are its period and amplitude?
Day
1
2
3
4
5
6
7
8
9
10
11
12
Books
borrowed
102
76
91
140
98
74
88
137 100
75
92
139
o
not periodic
o periodic with a period of 4 and an amplitude of about 20
o periodic with a period of 4 and an amplitude of about 25
o
periodic with a period of 5 and an amplitude of about 25