t-84 plus

  1. F

    Sx comes up empty on my T-84 plus

    I have a T-84 plus.I trying to find the varience of these values, 1.51, 1.52, 1.54 , 1.36, 1.43 , 1.44, 1.61, 1.49. I put each value in the L list and calculated standard deviation but when I do the Sx box is alway empty.