The value of the middlemost observation, obtained after arranging the data in ascending or descending order, is called the median of the data.įor example, consider the data: 4, 4, 6, 3, 2. 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. Types of Dataĭata can be present in raw form or tabular form. 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.
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