Class mid points and class interval or width, Mathematics

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Class Mid points

This is very significant values which mark the center of a provided class. They are acquired by adding together the two limits of a provided class and dividing the result by 2.

Class interval or width

It is the difference between a lower class boundary and upper class boundary. The value normally measures the length of a provided class.

Age (yrs)	No. of Students (f)	mid points (x)	x-a = d	D/c = u	fu
15 - 19	21	17	-15	-3	-63
20 - 24	35	22	-10	-2	-70
25 - 29	38	27	-5	-1	-38
30 - 34	49	32(A)	0	0	0
35 - 39	31	37	+5	+	31
40 - 44	19	42	+10	+2	38
	193				-102

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