# How to calculate median of grouped data

Calculating the median of grouped data can be a daunting task for many students. However, with the right approach, it can be quite easy to determine the median of grouped data. This article will provide a step-by-step guide on how to calculate the median of grouped data with writing patterns using JavaScript.

calculate median, grouped data, writing patterns, JavaScript.

## How to Calculate Median of Grouped Data with Writing Patterns Using JavaScript

Calculating the median of grouped data can be a daunting task for many students. However, with the right approach, it can be quite easy to determine the median of grouped data. This article will provide a step-by-step guide on how to calculate the median of grouped data with writing patterns using JavaScript.

### Step 1: Organize the Data

The first step in calculating the median of grouped data is to organize the data into a frequency distribution table. This table should have two columns: one for the data intervals and the other for the corresponding frequency of the data points in each interval. The intervals should be equal in size and should not overlap. For example, if you have data ranging from 0 to 100, you could create intervals of size 10, such as 0-10, 10-20, 20-30, and so on.

### Step 2: Determine the Cumulative Frequency

The next step is to determine the cumulative frequency for each interval. Cumulative frequency is the sum of the frequencies of all the intervals up to and including the current interval. For example, if the frequency for the interval 0-10 is 5 and the frequency for the interval 10-20 is 7, then the cumulative frequency for the interval 10-20 would be 5 + 7 = 12.

### Step 3: Find the Median Class

The median class is the interval that contains the median value. To find the median class, you need to determine the total number of data points and divide it by 2. The result will give you the rank of the median value. You can then use the cumulative frequency to determine which interval contains the median value. The interval that contains the median value is the median class.

### Step 4: Calculate the Median

To calculate the median, you need to use the formula: Median = L + (((n/2) - CF) / f) x i, where L is the lower limit of the median class, n is the total number of data points, CF is the cumulative frequency up to the median class, f is the frequency of the median class, and i is the interval size. Once you have calculated the median using this formula, you have successfully determined the median of the group data.

### Step 5: Write the JavaScript Code

To calculate the median of grouped data using JavaScript, you need to write a function that takes in an array of objects representing the frequency distribution table. Each object should have two properties: interval and frequency. The interval property should be an array with two values representing the lower and upper limits of the interval. The frequency property should be the frequency of the data points in that interval. An example of an object would be {interval: [0, 10], frequency: 5}. The function should then follow the steps outlined above to calculate the median of the grouped data.

### Step 6: Declare the Function

To start, you need to declare the function. Let’s call it calculateMedian. The function should take in an array of objects as a parameter.

### Step 7: Define Variables

Next, you need to define variables to store the necessary information. You will need variables to store the total number of data points, the rank of the median value, the median class, the lower limit of the median class, the cumulative frequency up to the median class, the frequency of the median class, and the interval size. You can use a for loop to calculate the total number of data points and the cumulative frequency for each interval.

### Step 8: Determine the Median Class

After defining the variables, you need to determine the median class using the rank of the median value and the cumulative frequency. You can use another for loop to do this.

### Step 9: Calculate the Median

Once you have determined the median class, you can use the formula outlined in Step 4 to calculate the median. You can then return the median from the function.

### Step 10: Add Function to HTML Document

To use the function in an HTML document, you need to add it to a script tag in the head section of the document. You can then call the function from a script tag in the body section of the document.

### Step 11: Examples

Here are some examples of how to use the calculateMedian function:

### Step 12: Example 1

Suppose you have the following frequency distribution table: [{interval: [0, 10], frequency: 5}, {interval: [10, 20], frequency: 7}, {interval: [20, 30], frequency: 12}, {interval: [30, 40], frequency: 15}, {interval: [40, 50], frequency: 10}]. To calculate the median, you would call the calculateMedian function passing this array as a parameter: calculateMedian([{interval: [0, 10], frequency: 5}, {interval: [10, 20], frequency: 7}, {interval: [20, 30], frequency: 12}, {interval: [30, 40], frequency: 15}, {interval: [40, 50], frequency: 10}]). The result would be 30.

### Step 13: Example 2

Let’s take another

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