1. ©G Dear 2010 – Not to be sold/Free to use
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Applied Mathematic
(Preliminary General 1)
Range and IQR
with FDT
Stage 6 - Year 11
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©G Dear 2010 – Not to be sold/Free to use

2. Interquartile Range = Q3 – Q1
Frequency Distribution Tables & IQR.
Interquartile Range = Q3 – Q1
Class
Class-Centre f cf
0-4
5-9
10-14
15-19
20-24
25-29
30-34
Median =
31÷2=15.5
16th score 17
(0+4)÷2 2 2 2
Q1 =
8th & 9th scores
16÷2=8 12 12 +
(5+9)÷2 7 3 5
Q3 =
16+16÷2=24
24th & 25th
scores 22 22 +
(10+14)÷2 12 5 10
6th to 10th scores +
IQR = 22
- 12
(15+19)÷2 17 9 19
11th to 19th scores +
= 10
(20+24)÷2 22 7 25
20th to 25th scores +
Range = 34
- 0
(25+29)÷2 27 4 29 +
= 34
(30+34)÷2 32 2 31
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