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For observations of pairs (x,y) of the v...

For observations of pairs (x,y) of the variables x and y, the following results are obtained
`sumx=100, sumy=70, sumx^(2)=2500, sumy^(2)=2000, sumxy=100 and n =20`.
Find the equation of the line of regresion of X and Y. Estimate the value of x if y=4.

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