MathCastle
StatisticsHardTwo Variables

Two Variables · Hard problem

For a data set, ∑(x−xˉ)(y−yˉ)=−42\sum(x - \bar x)(y - \bar y) = -42, ∑(x−xˉ)2=49\sum(x - \bar x)^2 = 49 and ∑(y−yˉ)2=64\sum(y - \bar y)^2 = 64. Find rr.