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CIE 9709 2025 November Paper 55 Q4

A Level / CIE / S1

CIE 9709 2025 Nov Paper 55 Paper · Question 4

题目

Problem

The heights, in cm, of 15 players from each of two sports teams, Pelicans and Swans, are given in the table.

Pelicans156160164165167170171173178182182184185186187
Swans170180183165174158170181162178174163191182174

(a) Draw a back-to-back stem-and-leaf diagram to represent the heights of the players from Pelicans and Swans, with Pelicans on the left-hand side.

(4)

(b) Find the median and the interquartile range of the heights of the Pelicans.

(3)

For the Swans, the lower quartile of the heights is 165 cm165\,\mathrm{cm}, the median is 174 cm174\,\mathrm{cm} and the upper quartile is 181 cm181\,\mathrm{cm}.

(c) Represent the data shown in the back-to-back stem-and-leaf diagram by a pair of box-and-whisker plots in a single diagram.

(3)

(d) Make one comparison between the heights of the Pelicans players and the heights of the Swans players.

(1)
题目中文翻译

下表列出了 Pelicans 和 Swans 两支运动队各 15 名队员的身高,单位为厘米。

Pelicans156160164165167170171173178182182184185186187
Swans170180183165174158170181162178174163191182174

(a) 画出背靠背茎叶图表示 Pelicans 和 Swans 两队队员的身高,将 Pelicans 队的数据放在左侧。

(4)

(b) 求 Pelicans 队身高的中位数和四分位距。

(3)

Swans 队身高的下四分位数为 165 cm165\,\mathrm{cm},中位数为 174 cm174\,\mathrm{cm},上四分位数为 181 cm181\,\mathrm{cm}。

(c) 在同一张图上画出一对箱线图,表示背靠背茎叶图中的数据。

(3)

(d) 对 Pelicans 队员与 Swans 队员的身高作出一项比较。

(1)
原卷通用作答要求

Answer all questions. You should use a calculator where appropriate.

You must show all necessary working clearly; no marks will be given for unsupported answers from a calculator.

Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place for angles in degrees, unless a different level of accuracy is specified in the question.

请回答所有题目。适当时应使用计算器。必须清楚展示所有必要的计算过程;仅给出计算器答案而没有过程,不予评分。除非题目另有精度要求,非精确数值答案保留 3 位有效数字,以度为单位的角度保留 1 位小数。

解答

(a)

解法一

思路

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用前两位作茎、个位作叶,Pelicans在左侧。左侧从茎向外递增,右侧从茎向外递增,重复值不能省略。

答题过程

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Use the first two digits as stems and the final digit as each leaf, with Pelicans on the left.

Key: 1 ∣ 17 ∣ 81\,|\,17\,|\,8 represents 171 cm171\,\mathrm{cm} for Pelicans and 178 cm178\,\mathrm{cm} for Swans.

(b)

解法一

思路

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15个有序数据的中位数为第8个值,下、上四分位数分别为第4、第12个值。

答题过程

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For Pelicans, the median is the 8th height, 173 cm173\,\mathrm{cm}.

The lower quartile is the 4th height, 165 cm165\,\mathrm{cm}, and the upper quartile is the 12th height, 184 cm184\,\mathrm{cm}. Hence

interquartile range=184−165=19 cm.\text{interquartile range}=184-165=\boxed{19\,\mathrm{cm}}.

(c)

解法一

思路

展开

两组使用同一高度刻度,分别标出最小值、下四分位数、中位数、上四分位数、最大值。

答题过程

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Use these five-number summaries:

TeamMinimumLower quartileMedianUpper quartileMaximum
Pelicans156156165165173173184184187187
Swans158158165165174174181181191191

Draw the boxes and whiskers on one common linear scale labelled “Height (cm)”, and identify each team.

(d)

解法一

思路

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比较必须说明身高的实际情况。Swans的四分位距较小,可以据此比较中间一半球员身高的稳定程度。

答题过程

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The Swans’ heights are more consistent, with an interquartile range of 181−165=16 cm181-165=16\,\mathrm{cm} compared with 19 cm19\,\mathrm{cm} for the Pelicans.