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To find the median and mean of the accident data for Klang Valley, let's go through each step:

### Step 1: List the Data
The number of accidents reported over twelve months is:
\[
19, 17, 22, 18, 28, 34, 45, 39, 38, 44, 34, 10
\]

### Step 2: Mean Calculation
To find the mean, sum all the values and then divide by the number of values.

1. Sum of the values:
   \[
   19 + 17 + 22 + 18 + 28 + 34 + 45 + 39 + 38 + 44 + 34 + 10 = 348
   \]

2. Number of values: \( 12 \)

3. Mean:
   \[
   \text{Mean} = \frac{348}{12} = 29
   \]

### Step 3: Median Calculation
To find the median, first, arrange the values in ascending order:
\[
10, 17, 18, 19, 22, 28, 34, 34, 38, 39, 44, 45
\]

Since there are \(12\) values, which is an even number, the median will be the average of the \(6^\text{th}\) and \(7^\text{th}\) values.

1. The \(6^\text{th}\) value is \(28\) and the \(7^\text{th}\) value is \(34\).
   
2. Median:
   \[
   \text{Median} = \frac{28 + 34}{2} = \frac{62}{2} = 31
   \]

### Summary:
- **Mean:** 29
- **Median:** 31

Would you like more details on any of these steps, or do you have any other questions?

Here are some related questions you might consider:
1. What would be the mode of the data set?
2. How would the mean and median change if an additional data point is added?
3. What is the range of this data set?
4. How does the median differ from the mean in representing data centrality?
5. What other statistical measures can be calculated from this data?

**Tip:** The median is often a better measure of central tendency when dealing with outliers, as it is less affected by extreme values than the mean.

The number of accidents reported during the last twelve months in Klang Valley is: 19, 17, 22, 18, 28, 34, 45, 39, 38, 44, 34, 10. Find the median and mean.

Learn how to calculate the mean and median of accident reports in Klang Valley over the last 12 months. This problem covers key statistical concepts and is suitable for Grades 7-9 students.

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