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To find the percentage of attendees who were over 55 years old, we need to:

1. **Read the cumulative frequency at age 55** from the graph.
2. **Subtract** this cumulative frequency from the total number of attendees (which is 80) to find how many are over 55.
3. **Calculate the percentage** of attendees over 55 by dividing the number of people over 55 by 80 and multiplying by 100.

### Step-by-Step Solution:
1. From the graph, locate the cumulative frequency at 55 years.
   - The cumulative frequency at age 55 looks to be around **68**.

2. The number of attendees over 55 = \( 80 - 68 = 12 \).

3. To calculate the percentage:
   \[
   \text{Percentage} = \left( \frac{12}{80} \right) \times 100 = 15\%
   \]

So, **15%** of the attendees were over 55 years old.

Would you like more details on the explanation or need help with any other part?

Here are 5 related questions to consider:
1. What is the cumulative frequency for attendees under 50 years old?
2. How would the calculation change if we were finding the percentage over 60 years old?
3. What is the median age of the attendees, based on this graph?
4. Can we estimate the interquartile range (IQR) using the graph?
5. How do you calculate cumulative frequency in a grouped frequency table?

**Tip:** For cumulative frequency diagrams, the steepest part of the curve indicates the interval with the most attendees.

80 people attend an outdoor yoga session. Their ages are recorded and used to draw a cumulative frequency diagram. Work out the percentage of attendees that were over 55 years old.

Learn how to calculate the percentage of attendees over 55 years old in a group of 80 at an outdoor yoga session using a cumulative frequency diagram. This tutorial explains the steps involved in reading the cumulative frequency at age 55 and computing the percentage.

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