Need help reading formula 1 Attachment(s) Hi all, I am having serious trouble trying to read the formula attached. If someone could explain to me what it means in English I would be extremely grateful. I know what most of the variables are but I am wondering if the P has a mathematical meaning? 
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That says that the probability that the value of MTBF lies between those two fractions of MTBF (which depend upon $\displaystyle \alpha$) is less than $\displaystyle 1 \alpha$. 
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