Page 276 - F2 - MA Integrated Workbook STUDENT 2018-19
P. 276
Chapter 12
If the trend is not constant then the average increase can be calculated
Example 5
The trend for a set of data is as follows:
Month Trend
Jan 100
Feb 102
March 106
April 111
May 114
June 118
What is the trend figure for September?
Average trend
= (last known trend – first known trend)/(number of sets of data – 1)
= (118 – 100) / (6-1) = 3.6
Trend for September = 118 + (3.6 × 3) = 128.8
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