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Mean from frequency tables - discrete data
Heather asks her friends to tell her the size of their families. She
records the data in a frequency table.
NUMBER OF PEOPLE
To calculate the mean number of people in each family we need to find the
total number of people in the survey and the number of families.
In this survey a total of 20 families were surveyed and it was found that
there were 78 people altogether.
Therefore the mean = 78/20 = 3.9 people per family.
Finding the mean from a discrete frequency table
* The frequency table tells you how many there are for each value.
* So you can work out the sub-total value of the results in each column
by multiplying: value x frequency.
* Then you can add them all to find the grand total of these sub-totals.
* The mean is just the average. So you divide the grand total by the
total frequency: total value divided by total frequency = mean.
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