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To solve this problem, we need to determine the percentage of office workers who took more than 90 minutes to get to work based on the cumulative frequency graph.

### Step-by-Step Solution:

1. **Locate 90 Minutes on the Time Axis**:
   - On the horizontal axis (time in minutes), find the point for 90 minutes.

2. **Find the Cumulative Frequency at 90 Minutes**:
   - From 90 minutes on the time axis, go up to the curve and then horizontally to the cumulative frequency axis.
   - This value is approximately 78.

3. **Interpretation of Cumulative Frequency**:
   - The cumulative frequency of 78 at 90 minutes means that 78 workers took **90 minutes or less** to get to work.

4. **Calculate the Workers Who Took More Than 90 Minutes**:
   - Since there are 80 office workers in total, the number who took more than 90 minutes is:
     \[
     80 - 78 = 2
     \]

5. **Calculate the Percentage**:
   - To find the percentage, use the formula:
     \[
     \text{Percentage} = \left(\frac{2}{80}\right) \times 100
     \]
   - Calculating this gives:
     \[
     \text{Percentage} = 2.5\%
     \]

### Answer:
The estimated percentage of office workers who took more than 90 minutes to get to work is **2.5%**.

Would you like more details or have any questions?

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Here are some related questions for further understanding:

1. How would the percentage change if the total number of workers was different?
2. Can we estimate the median time taken by the workers to get to work from this graph?
3. How would we interpret the graph if it had a steeper slope in the earlier time intervals?
4. What would be the percentage if we wanted to know the workers who took more than 100 minutes?
5. Can cumulative frequency graphs help in understanding other types of distributions?

**Tip:** In cumulative frequency graphs, the curve's steepness indicates where most data points are concentrated.

Use your graph to find an estimate for the percentage of these office workers who took more than 90 minutes to get to work.

Learn how to use a cumulative frequency graph to estimate the percentage of office workers taking more than 90 minutes to get to work. This problem demonstrates the use of cumulative frequency data and percentage calculation, suitable for students in Grades 7-9.

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