- What does the Capital Sigma mean in linear correlation/regression?

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Coinissuchthatheadoccurs3timesasoftenas tails.Thiscointossed3timesLetXberandom variable, thenumberofheadsthatappearFind prob.massfunctionofx? Why does black people's skin seem so much tougher than white people's skin? F:(0,+∞)->R, f(x)=x^3+lnx. Show that x^3+lnx>=1, (∀) x>=1.? Boy holds a 40-N weight at arm’s length for 10sHis armis 1.5m above the ground.Theworkdonebytheforceof theboyontheweightwhileheisholdingit? Solve this issue?