![]() If n is odd, then use the formula:Įxample 1: Let's consider the data: 56, 67, 54, 34, 78, 43, 23. To find the median, we need to consider if n is even or odd. Step 2: Let the total number of observations be n.Step 1: Arrange the data in ascending or descending order.Let's arrange this data in ascending order: 2, 3, 4, 4, 6. For example, consider the data: 4, 4, 6, 3, 2. The value of the middlemost observation, obtained after arranging the data in ascending or descending order, is called the median of the data. Let the mean of x 1, x 2, x 3 … x n be A, then what is the mean of: Hence, we get the following table: Class mark (x i) , x n be the class marks of the respective classes. ![]() Note: Class mark = (lower limit + upper limit)/2 In this case, we find the classmark (also called as mid-point of a class) for each class. Find the average number of patients visiting the hospital in a day. The following table indicates the data on the number of patients visiting a hospital in a month. + f n)Įxample 1: Find the mean of the following distribution: xĮxample 2: Here is an example where the data is in the form of class intervals. When the data is present in tabular form, we use the following formula: We can find the arithmetic mean using the mean formula:Įxample: If the heights of 5 people are 142 cm, 150 cm, 149 cm, 156 cm, and 153 cm. Mean is calculated a little differently when the data is grouped or ungrouped. Mean is denoted by x̄ (pronounced as x bar). Mean = Sum of all observations/Number of observations To find his average score in a match, we calculate the arithmetic mean of data using the mean formula: For example, a cricketer's scores in five ODI matches are as follows: 12, 34, 45, 50, 24. The arithmetic mean of a given data is the sum of all observations divided by the number of observations. Let’s begin by understanding the meaning of each of these terms.
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