Question 1182516
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<font color=red>Answer: True</font>


Explanation: The two probabilities are complements, meaning that they add to 1. 
So 0.6+0.4 = 1


The fact that P(A)+P(B) = 1 is being used here has nothing to do with the underlying probability distribution. So the "normal distribution" seems like a red herring in my opinion (ie it may be "clue" that's added intentionally to distract/mislead the reader).


Either x is less than 10.7, or it is larger than 10.7
We consider the case x = 10.7 itself to happen with probability 0 since throwing a dart to land *exactly* at this location is pretty much 0 chance of it happening. There's always going to be some slight error involved. 


I guess to be more thorough, we could say {{{P(X <= 10.7) = 0.6}}} and {{{P(X > 10.7) = 0.4}}}
Or we could say {{{P(X < 10.7) = 0.6}}} and {{{P(X >= 10.7) = 0.4}}} to ensure that 10.7 itself is involved somehow. Though this is a trivial nitpicky detail. 



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