CAIE IGCSE Mathematics Extended E9.3 Averag…pread

Covered syllabus points

E9.3.1 Calculate the mean, median, mode, quartiles, range and interquartile E9.3.2 Calculate an estimate of the mean for grouped discrete or grouped E9.3.3 Identify the modal class from a grouped frequency distribution.

[Maximum number: 4]

These are Rahul's 10 test scores.
9
8
9
10
7
x
9
9
x
7

The mean of these scores is 8.

Find the interquartile range.
You must show all your working.

$\frac{68+2x}{10}=8$ or better
x=6
Lower quartile = 6.5 or 6.75 or 7, or upper quartile = 9
2 or 2.25 or 2.5 nfww

[Maximum number: 4]

The height, h cm, of each of 100 students is measured.
The table shows the results.
Calculate an estimate of the mean.

Table for Question 2 — CAIE IGCSE Mathematics Extended

160.375

M1 for mid-values for three of 125, 155, 162.5, 175.
M1 for $\Sigma fx$ , where x is in the correct interval including boundary.
M1 dep for $\frac{\sum fx}{100}$ , dep on second M1.

[Maximum number: 1]

The heights, h metres, of the 120 boys in an athletics club are recorded.
The table shows information about the heights of the boys.

Table for Question 3 — CAIE IGCSE Mathematics Extended

Write down the modal class.
$<h \leqslant$

$1.5<h\leqslant1.6$

All question bank results loaded

CAIE IGCSE Mathematics Extended E9.3 Averages and Measures of Spread Topic Practice

Covered syllabus points

Question 1

Question 2

Question 3