O-LevelComputer ScienceAlgorithm design and problem-solving2210/22 · Oct/Nov 2017 · Q26 Marks
Write an algorithm using either pseudocode or a flowchart, to: • input a positive integer • use this value to set up how many other numbers are to be input • input these numbers • calculate and output the total and the average of these numbers.
- Write an algorithm using either pseudocode or a flowchart, to: • input a positive integer • use this value to set up how many other numbers are to be input • input these numbers • calculate and output the total and the average of these numbers.[6]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- 1 mark for each, there may be other solutions, award full marks for any working solution
- any six from:
- initialise total (outside loop)
- Input number of numbers (outside loop with validation)
- Loop using input value
- Input number (inside loop)
- Update Total (inside loop)
- Calculate average
- Print average and total (outside loop)
- Sample algorithm:
- INPUT NumberCount
- Total ← 0
- FOR Count ← 1 TO NumberCount
- INPUT Number
- Total ← Total + Number
- NEXT
- Average ← Total/NumberCount
- PRINT Total, Average
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