Computer Science · May / June 2025 · Paper 22 · Question 7
0478
As printed in the paper
The question as text
The flowchart shows an algorithm that is used to input 50 numbers. Each number is stored in the variable ¾© when it is input. Any number input that is less than or equal to –20 or greater than or equal to 50 is rejected and re-input. The accepted numbers are added together as they are entered and the total and average of these numbers are output at the end of the algorithm.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
7(a)[6]
One mark per mark point, max six
MP1 input Value
MP2 correct check that Value is
between −20 and 50,
exclusive
MP3 totalling values
MP4 counting number of values
MP5 checking Count = 50 / >= 50
MP6 output of total and average
START
Count ← 0
Total ← 0
INPUT Value
IS Value <=
No
Yes Total ← Total + Value
–20 OR Value
>= 50 ?
IS Count = 50
No Count ← Count + 1
YesOUTPUT Total
OUTPUT Total/50
STOP
7(b)[4]
One mark per statement
MP1 Change INPUT Value so that it saves values into an array
MP2 … using the counter as the index
MP3 Outside the (first) loop, set up a loop that will iterate 50 times MP4 Use an output statement inside the (second) loop to output the contents of the array, using the counter as the index.
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