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Rewritten by : Barada
Option: c is the correct answer.
Periodic with a period of 4 and amplitude of about 25.
We are given a data set as:
Day 1 2 3 4 5 6 7 8 9 10 11 12
Books 102 78 91 140 98 74 88 137 100 75 92 139
borrowed
We divide the data set into three parts as follows:
1)
Day 1 2 3 4
Books Borrowed 102 78 91 140
2)
Day 5 6 7 8
Books Borrowed 98 74 88 137
3)
Day 9 10 11 12
Books Borrowed 100 75 92 139
As we see that the values repeat approximately after every 4 values.
This means that the period of the data set is: 4
Also the amplitude of the data set is the average of difference between the maximum value and the minimum value.
1)
Amplitude=(140-78)/2=31
2)
Amplitude=(137-74)/2=31.5
3)
Amplitude=(139-75)/2=32
The most approximate answer is:
Amplitude= 25
