Calculate the mean of the following distribution using Assumed Mean Method:

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Class Interval x	Frequency f	Mid x	A = 25 d = x -A	fd
0-10	5		-20	-100
10-20	7	15		-70
20-30	15	25	0	0
30-40	28	35	10
40-50	8	45	20	160
	Σf=			Σfd=