# Sum problem about closing form

by joshmccraney
Tags: closing, form
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 P: 346 $$\sum_{i=1}^{n} |(y_i-\theta)|=n\theta$$ where theta is a fixed constant and $y_i$ is a discrete random variable. does anyone know how to rewrite in close form?? also, everytime i use latex it starts a new line. how can i fix this so i can type directly with my sentances? thanks
 Math Emeritus Sci Advisor Thanks PF Gold P: 39,568 Instead of using "tex" use "itex".
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 Quote by joshmccraney $$\sum_{i=1}^{n} |(y_i-\theta)|=n\theta$$ where theta is a fixed constant and $y_i$ is a discrete random variable.
It isn't clear what you mean by that equation. Are the $y_i$ random variables that are dependendent on each other in a way that forces $\sum_{i=1}^n |(y_i-\theta)|$ to always add up to be $n \theta$?

Or are you using the notation "|...|" to mean "expected value" instead of "absolute value"?

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