Mean, Variance and Standard Deviation
	X			X-M		X-M^2
1	19			-21		441
2	23			-17		289
3	29			-11		121
4	31			-9		81
5	35			-5		25
6	44			4		16
7	48			8		64
8	50			10		100
9	58			18		324
10	63			23		529
Sum	400			0		1990
Count	10
MEAN	40
		Variance
			Population			199.0
			Sample			221.1
		Standard Deviation
			Population			14.1
			Sample			14.9