18N.1.SL.TZ0.T_2
The histogram shows the lengths of 25 metal rods, each measured correct to the nearest cm.
The upper quartile is 4 cm.
Write down the modal length of the rods.
[1]
a.
Find the median length of the rods.
[3]
b.
Calculate the lower quartile.
[1]
c.i.
Calculate the interquartile range.
[1]
c.ii.
Markscheme / solution
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
3 (A1) (C1)
[1 mark]
a.
median is 13th position (M1)
CF: 2, 6, 14, 20, 23, 25 (M1)
median = 3 (A1) (C3)
[3 marks]
b.
2.5 (A1) (C1)
Note: Award (A1)(ft) if the sum of their parts (c)(i) and (c)(ii) is 4.
[1 mark]
c.i.
1.5 (A1)(ft) (C1)
Note: Award (A1)(ft) if the sum of their parts (c)(i) and (c)(ii) is 4.
[1 mark]
c.ii.
Examiners’ report
[N/A]
a.
[N/A]
b.
[N/A]
c.i.
[N/A]
c.ii.