Two machines, $$$A$$$ and $$$B$$$, produce metal rods of a certain type. The lengths, in metres, of 19 rods produced by machine $$$A$$$ and 19 rods produced by machine $$$B$$$ are shown in the following back-to-back stem-and-leaf diagram. Key: 7 22 4 means 0.227 m for machine A and 0.224 m for machine B . Find the median and the interquartile range for machine $$$A$$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_s20_qp_52 Year：2020 Question No：3(a)

Answer:

Median $=0.238$
$\mathrm{UQ}=0.245, \mathrm{LQ}=0.231$,
So IQR $=0.245-0.231$
$0.014$

Knowledge points:

5.1.3 understand and use different measures of central tendency (mean, median, mode) and variation (range, interquartile range, standard deviation) (e.g. in comparing and contrasting sets of data.)

Answer:

Knowledge points:

Solution:

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