Edexcel IGCSE Math B 10.B Mean, median & mode Question Bank

Practise finding mean, median and mode from lists, tables and contextual totals, including missing values and combined groups.

Exam points

order a data list before choosing the middle value or the mean of two middle values
use total = mean × number to recover missing totals or group means
form an equation linking mean and median when a listed value is unknown

[Maximum number: 4]

Here are the weights, in kilograms, of 12 children.

\begin{array}{llllllllllll} 19 & 25 & 28 & 21 & 22 & 21 & 26 & 28 & 24 & 20 & 29 & 28 \end{array}

Calculate

(a)

the median weight,

[ 2 ]

Rearranged weights:
19,20,21,21,22,24,25,26,28,28,28,29 $\text{Median}=\frac{24+25}{2}=24.5$

Answer: 24.5 kg.

Marks: M1 for ordered list and middle-pair method; A1.

(b)

the mean weight.

[ 2 ]

$\text{Mean}=\frac{19+25+28+21+22+21+26+28+24+20+29+28}{12}=24.25$

Answer: 24.25 kg.

Marks: M1, A1.

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10.B Mean, median and mode question 1

Question (a)

Question (b)