What fraction of members were between 150 and 160 cm tall?

Step 1: Identify the frequency table from the graph.

Height (cm) | Frequency (members)
150–160 & 18 \
160–170 & 39 \
170–180 & 58 \

Step 2: Calculate the total number of members.

Formula: total frequency = sum of all frequencies
$18 + 39 + 58$

Substitute:
$18 + 39 = 57$
$57 + 58 = 115$

Total number of members = 115 members.

Step 3: Identify the frequency for members between 150 cm and 160 cm tall.

Frequency = 18 members.

Step 4: Calculate the fraction.

Formula: fraction = $\frac{frequency in interval}{total frequency}$
$\frac{18}{115}$

Step 5: Simplify the fraction.

Check common factors:
18 = $2 \times 3^2$
115 = $5 \times 23$
GCD(18, 115) = 1

The fraction $\frac{18}{115}$ is already in its simplest form.

\dfrac{18{115}}