O-LevelComputer ScienceData Representation2210/11 · May/June 2025 · Q29 Marks

A clothes store has a ticket system to allow customers to speak to a personal shopper. The ticket displays a ticket number in hexadecimal, for example 11B.

(a)The ticket system has an output device that creates a paper ticket. Identify an appropriate output device to produce the paper ticket.[1]
(b)(i)Each ticket number is stored as a binary number in the ticket machine. Two ticket numbers are 14B and 97A. Convert the two ticket numbers from hexadecimal to binary. 14B 97A[2]
(b)(ii)Give two reasons why the ticket number is displayed as hexadecimal instead of binary. 1 2[2]
(c)(i)The ticket numbers could also be represented as denary. Convert the two ticket numbers from hexadecimal to denary. 02C 10B[2]
(c)(ii)Convert the two denary numbers into hexadecimal. 109 415[2]

Mark scheme

Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.

[1] Printer
[2] 0001 0100 1011 1001 0111 1010
[2] Any two from: • Easier/quicker for the customer to understand/read/remember • Takes up less space on the ticket // Shorter representation
[2] 44 267
[2] (0)6D 19F

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Topic: Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 9 marks.
Source: O-Level Computer Science, May/June 2025 Paper 1 Variant 1, question 2.

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