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First u have to create a table with four columns...
In first column write the values of more than marks and in the second column write the number of students in the third column find Xi which is the lower limit + upper limit by 2 and in the fourth column find the product of the number of students and Xi
Then add up the no of students and the fourth colour separately......
Then use the formula of mean to find the mean of it....
The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.
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