REPOST!!!! john c

can u please help me understand , work and solve please. Let me know what you are charging .thanks

 

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S(Xi-X)=

 

S(Xi-X) 2=

 

N-1 =
 

s2 = S(XiX) 2=                   

N-1

r u

           (SX)2

s2=SX2N=

N-1

 

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