Class7 Maths : Mean, Median, Mode and Range
1. Mean (Average) Definition The mean is the average of a group of numbers. Formula Mean = Sum of all observations ÷ Number of observations Explanation To find the mean, add all the values and divide the total by how many values are there. Example 1 Find the mean of: 4, 6, 8, 10 Solution: Sum = 4 + 6 + 8 + 10 = 28 Number of values = 4 Mean = 28 ÷ 4 = 7 Answer: Mean = 7 Example 2 Find the mean of: 12, 15, 18, 10, 5 Solution: Sum = 60 Number of values = 5 Mean = 60 ÷ 5 = 12 Answer: Mean = 12 Real-Life Uses of Mean Average marks of a student Average temperature of a week Average salary in an office Average runs of a cricket player 2. Median Definition The median is the middle value when the data is arranged in order. Steps to Find Median Arrange the data in ascending order Find the middle value Odd number of values → middle one Even number of values → average of two middle values Example 1 Find the median of: 5, 2, 9, 1, 7 Solution: Ord...