O-LevelComputer ScienceAlgorithm design and problem-solving2210/22 · Oct/Nov 2017 · Q57 Marks
This flowchart checks a batch of 10 rice sacks for weight. Sacks should weigh 50 kilograms each. Sacks weighing over 50.5 kilograms or less than 49.5 kilograms are rejected. The number of sacks accepted and the number of sacks rejected is output. [Figure 5.1]
- (a)Complete the trace table for the input data: 50.4, 50.3, 49.1, 50.3, 50.0, 49.5, 50.2, 50.3, 50.5, 50.6 Accept Reject Count Sack OUTPUT[5]
- (b)The size of the batch has increased to 50 sacks. It has been decided to only reject sacks that are underweight. State the changes that need to be made to the flowchart.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- Accept, Reject, Count, Sack, OUTPUT
- 0, 0, 0
- 1, , 1, 50.4
- 2, , 2, 50.3
- , 1, 3, 49.1
- 3, , 4, 50.3
- 4, , 5, 50.0
- 5, , 6, 49.5
- 6, , 7, 50.2
- 7, , 8, 50.3
- 8, , 9, 50.5
- , 2, 10, 50.6, 8 2
- [1 mark]
- change to Is Count = 50?
- remove IS Sack > 50.5?
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