Finding the Mean, Median and Mode From a Grouped Frequency Table
 

Worked example

Find the mean, median and mode from this frequency table.

Time Spent On Internet (£ per week)	Frequency (f)	Midpoint (x)	f × x
0 -	2	2.5	5
5 -	5	7.5	37.5
10 -	9	12.5	112.5
15 -	4	17.5	70
	Sf = 20		Sfx = 225

• The Mean

  Sfx	=	225	=	£11.20
  Sf		20

  
  

• The median is £12.50 (the 10th/11th value).

• The mode is £12.50 (the most common).