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OpenStudy (anonymous):
Find the expression for the mean and standard deviation for the following data. Complete algebraically. 4a+6b a-b a+b 2a-ab I got: 4a+6b+a-b+a+b+2a-2b/4 = 8a+4b/4 Mu = 2a+b and then for the standard deviation I got: sqr 6a^2+38b^2/4 *** not sure how to go on from this point down
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