Answer : 10 or 13
I hope this helped and feel free to pm me!
Yes the probability of an outcome that lies within 68% is a good indicator that lies in which standard deviation.
Answer:
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Step-by-step explanation:
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Answer:

Step-by-step explanation:
in the equation given these are the values:
a=1 b= -5 c= -7
if we plug this in the quadratic formula 
this is simplified to 
hope this helped