A mountain

A mountain climber plans to buy some rope to use as lifeline. Which of the following would be the better choice? Explain your choice.
Rope A: Mean breaking strength:500lb; standard deviation of 100lb
Rope B: Mean breaking strength: 500lb; standard deviation of 10lb

Result

x = (Correct answer is: B) Wrong answer

Solution:

m1=500 lb s1=100 lb  m2=500 lb s2=10 lb  p1=p(N,m1,s1,x<490)=0.4602 p2=p(N,m2,s2,x<490)=0.1587  p1>p2  x=B



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