Edexcel IGCSE Math B 10.E probability language

Practise probability-language questions by interpreting does not, greater than or event wording before writing the required probability.

Exam points

Use complement language such as does not arrive late or does not land on red.
Find probabilities from simple contexts such as flights, spinners or school attendance.
Convert wording like greater than a value into the correct event count or probability.

[Maximum number: 1]

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

One of these 12 children is chosen at random.

Find the probability that this child has a weight that is less than 28 kg.

There are 8 weights less than 28 kg out of 12.
$\frac8{12}=\frac23$

Answer: $\frac23$ .

Marks: B1.

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