Mean of a frequency table
We already know how to find the Mean of discrete data (refer to Mean, Median and Mode)
Find the Mean of a frequency table with this formula:
Mean  
It usually involves two additional steps:
 Example 1. This table shows stars awarded to students in a sports club. Find the mean of
Stars x  1  2  3  4  5 
Frequency f  2  8  4  3  3 
(a) Work out fx for each value of x. That is multiply f by x

(b) Work out the sum (add up) the columns f and then fx

(c) Work out the Mean
to: