Less-than
		Class Interval	Class frequency	Upper class limit	Cumulative Frequency	Cumulative Percent
			10
	1	30	to under	40	5	40	5	14%
	2	40	to under	50	2	50	7	19%
	3	50	to under	60	7	60	14	39%
	4	60	to under	70	9	70	23	64%
	5	70	to under	80	7	80	30	83%
	6	80	to under	90	5	90	35	97%
	7	90	to under	100	1	100	36	100%
					40

		1
1)	Calculate P65		x
			N
			i
			Lx
			fx
			efx
			Px
		2
2)	Calculate D4		x
			N
			i
			Lx
			fx
			efx
			D4
		3
3)	Calculate Q1		x
			N
			i
			Lx
			fx
			efx
			Q1
		4
4)	Calculate the Median		x
		N
			i
			Lx
			fx
			efx
			Pmedian