In the class, weight of students is measured for the class records. Calculate mean weight of the class students using direct 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!

Weight in kgs (x)	Number of students (f)	Mid value of x	fx
15-25	4		80
25-35	11	30	330
35-45	19	40	760
45-55	14	50	700
55-65	0		0
65-75	2	70	140
	Σf=