GB-18-07-001 · Two-way tables

The table shows how students travel to school.

	Walk	Bus
Year 10	8	11
Year 11	4	10

One of these students is chosen at random. Find the probability that this student is in Year 11 and travels by bus.

Two-Way Tables & Probability Application of related method — Booklet p. 60

Method

1) Sum all four cells to find the grand total

2) Divide the target cell count by the grand total

Worked Example (GB-18-07-001)

Total 33.

\frac{10}{33}

Ans =

\frac{10}{33}