P(F > x) : what do you call this?

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What do you call P(F > x) (e.g. P(F > 4.2)? I'm trying to figure out a formula to arrive at the number given after the > sign using just two given degrees of freedom and I figured that if I knew the name of it I would be able to google it up. Thank you.

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That's often call the survival function, usually denoted $S(t)$. Note $S(t)=1-F(t)$.

It gives the probability of survival beyond time $t$, if the random variable represents the time of death/failure.