[PDF] median mode grouped data pdf

What is the median height for grouped data?

Thus, the observations lie between the class interval 145-150, which is called the median class. Cumulative frequency of the class preceding the median class, cf = 11. We know that the formula to find the median of the grouped data is: Median = 149.03. Therefore, the median height for the given data is 149. 03 cm.

How do you find the mean and median of a group?

For grouped data, we cannot find the exact Mean, Median and Mode, we can only give estimates. Estimated Mean = Sum of (Midpoint × Frequency) Sum of Frequency L is the lower class boundary of the group containing the median B is the cumulative frequency of the groups before the median group

What is the difference between a median and a modal group?

The Median is the mean of the ages of the 56 th and the 57 th people, so is in the 20 - 29 group: L = 20 (the lower class boundary of the class interval containing the median) = 20 + 6.52... The Modal group is the one with the highest frequency, which is 20 - 29: = 20 + 2.22...

How do you find a median class?

To find the median class, we have to find the cumulative frequencies of all the classes and n/2. After that, locate the class whose cumulative frequency is greater than (nearest to) n/2. The class is called the median class. After finding the median class, use the below formula to find the median value.