what is the formula of mean , median , mode ?
Mean
The mean (or average) of a set of data values is the sum of all of the data values divided by the number of data values.
That is:
Median
The median of a set of data values is the middle value of the data set when it has been arranged in ascending order.
That is, from the smallest value to the highest value.
In General;
When n = no. of values is odd,
and
When n = number of values in the data set is even, then the median is the average of the two middle values.
Mode
The mode of a set of data values is the value(s) that occurs most often.
The formula used to find the mode when the data is given in groups is as follows.
Mode = |
Where, l = lower limit of the modal class
h = size of class interval (all class sizes should be equal)
f1 = frequency of the modal class
f0 = frequency of the class preceding the modal class
f2 = frequency of the class succeeding the modal class