my variance is -2.37583E+12
i need to find St Deviation but i cannot square root this number
can someone help me change this number so i can put it under a square root?
thanks
Firstly, you should know that variance is always non-negative. Here are some PROPERTIES if you want to have a look. So your proclaimed variance of
-2.37583E+12 does not make any sense.
Could you please post your actual question?
But if we change the number, we will get the wrong result, won't we?
You can't square root this number because it's a negative number. Negative numbers don't have square roots in real numbers. Are you sure your variance is correct?
Sorry Harish, I started writing when there were no replies yet. I don't know how to delete this post.
Code:x (cash prize $) P(x) X*P(X) X2*P(X) 15000000 6.8E-09 0.102 1530000 200000 0.00000028 0.056 11200 10000 0.000001711 0.01711 171.1 100 0.000153996 0.0153996 1.53996 7 0.004778961 0.033452727 0.234169089 4 0.007881463 0.031525852 0.126103408 3 0.01450116 0.04350348 0.13051044 0 0.972682422 0 0 0.298991659 1541373.131 Mean Variance St Dev 0.2989917 -2.37583E+12 ?