How To Find The Mean From A Grouped Frequency Table

Grouped Frequency Tables Are for Continuous Data A grouped frequency table is for continuous data.

How to find the mean from a grouped frequency table. We can use the following formula to estimate the standard deviation of grouped data. To find the mean number in this frequency table divide the total number of minutes. To calculate the Mean the cc and fx column must be added and filled in Class Frequency f 0-9 8 10-19 7 20-29 5 30-39 8 40-49 4 50-59 1 5.

Divide the total of this column by the total frequency. A Estimation of mean 1215div25 486kg b The modal class is the class that has the highest frequency. The frequency of the ith group.

As the data has been grouped the exact data values are not known so only an estimate of the mean can be found. This is unlike discrete data which can only take certain values. Class Frequency f 0-9 8 10-19 7 20-29 5 30-39 8 40-49 4 50-59 1 This is a Grouped Frequency Table 4.

Then multiply the midpoints by the frequency. In this case the modal class is. Calculate the Standard Deviation of Grouped Data.

Σnimi-μ2 N-1 where. Continuous data can take any value within a range. Our data is grouped.

She conducted a survey and her results are shown below. In each group each value x is greater than a lower value l i and less than an upper value u i. This statistics video tutorial explains how to calculate the mean of grouped data.