The mean is the most commonly used measure of average close. To calculate the mean, add the values together and divide the total by the number of values. If you place a set of numbers in order, the ...

Frequency tables can be used to help present sets of data. There are 4 children aged 10, which gives a total age of 40 in that category. There are 6 children aged 11, which gives a total age of 66 in ...