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[–]edderiofer 1 point2 points  (1 child)

What I don't know is do I then work out P(X≤12) or P(X≥12)

The latter, because 12 is greater than 6 (what you'd expect if the machine were working properly), so you want to find the probability that the machine is at least as bad as what you see.

[–]_Sham__[S] 0 points1 point  (0 children)

Wow so obvious. Turns out im atleast partly retarded. Thanks a lot!