How Do You Find The Mean From A Grouped Frequency Table

The marks column is the class interval.

How do you find the mean from a grouped frequency table. As the data has been grouped the exact data values are not known so only an estimate of the mean can be found. A Estimation of mean 1215div25 486kg b The modal class is the class that has the highest frequency. We can use the following formula to estimate the mean of grouped data.

How To Work Out The Mean From A Grouped Frequency Table. The frequency of the i th group. Now calculate an approximate group size by dividing the range by how many groups you would like.

Edexcel GCSE Modular Mathematics 2MB01Unit 1 - 13 Mean from a Grouped Data Table. The midpoint for each group can be found by taking the average of the lower and. Divide the total of this column by the total frequency.

Then round that group size up to some simple value like 2 instead of 183 or 5 instead of 426. She conducted a survey and her results are shown below. In this example it is 9.

First work out the midpoints of each group. To find the mean number in this frequency table divide the total number of minutes. Calculating the mean from a frequency table Sara wanted to know the ages of the children on the school bus.

In this example there are 9 numbers so the middle number is the 5 th. I is the number of each group where i 1 2. See Finding the Middle Number in the Top Tip.