Using your calculator for Statistics
Radio Shack calculators
1.	You need to change the Mode function on your calculator to  SD 
	(statistical data) by pressing: 
 		2ndF   ON/C   
				(STAT  should appear on the upper part of the screen)

2.	Before each calculation you need to clear the memory that contains the
	statistical data.  You can do that by pressing   
	2ndF     M+   and   ON/C 

3.	Entering data points without frequency
	Example data:      5, 8, 12, 4, 23

		Press:  				Display shows:
		5	M+				1
		8	M+				2
		12	M+				3
		4	M+				4
		23	M+				5

To find the mean  press:
			xM				10.4

To find the standard deviation  press:
			RM				7.7

To find the variance   press  x2.  (square the standard deviation)= 59.3
		
4.	Entering data points with frequency is not possible with this calculator