MINMINA ”? (beauty jun? Net) "can be checked, case? Word of mouth? Price? "Be sure to pay attention to avoid the pit? D(X)=E(X？ )-E？ (X)=( 1. 1？ + 1.9? +3? )/3- 4=4.60-4=0.6 σx=0.77D(Y)=E(Y？ )-E？ (Y) =(5？ + 10.4? + 14.6? )/3- 100 = 15.44σY = 3.93 X，Y:r(X，Y)=Cov(X，Y)/(σXσY)= 3.02/(0.77×3.93)= if error(INDEX(E $ 3:E $ 20，MATCH( 1，(B $ 3:B $ 20 = H3)*(D $ 3 :D $ 20 & gt； =I3),), "") JBOY3 =IFERROR(INDEX(E$3:E$20, MATCH( 1, (b $3: b $20 = H3) * (d $3: d $20 > =I3)，)，"")，，Ctrl+Shift+Enter，.