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Paper 1Statistical Techniques3 marks
A company records the monthly sales (in units) of a product over 8 months as follows: 120, 135, 150, 160, 155, 170, 165, 180.
Data Table
Monthly Sales Data
Sales units for 8 months
| Month | Sales (units) |
|---|---|
| 1 | 120 |
| 2 | 135 |
| 3 | 150 |
| 4 | 160 |
| 5 | 155 |
| 6 | 170 |
| 7 | 165 |
| 8 | 180 |
- a[3]
Calculate the 3-month moving average for months 3 to 8.
Aim for approximately 3 distinct marking points.
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