Hi

S	m	(x-µ)	(x-µ)^2	

4	6.00	-2.00	4.000	

5	6.00	-1.00	1.000	

6	6.00	0.00	0.000	

7	6.00	1.00	1.000	

8	6.00	2.00	4.000	

30			10.000	

			10/4 = 2.5 the variance	

Seven Matrons assembled for a meeting, shake hands with one another. 

How many handshakes take place: n(n-1)/n = 7*6/2 = 21 handshakes 

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