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