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Hi, Sure, here is my intentar. when X1 = 1, n=1, Y1= -1 X2 = 2, n=2 Y2=-0.707 X3 = 3, n=3, Y3=0 X4 = 4, n=4, Y4=1 X5 =5, n=5, Y5=2.242 Y=(-1,0,1,2) therefore: P(Y=-1)=1/4 P(Y=0) =1/4 P(Y=1)=1/4 P(Y=2)=0 P(-1≤Y≤ 2)= 3/4 I can not sure if is right.