1-2. A system is used to
support a normally distributed force 
lb. For the segment
AB the allowable yield stress is 
psi. What is the
minimum cross sectional area required of AB so that the probability of
failure is less the 10-3. Assume 
and 
are independent. Neglect the weight of
the board and steel beam system. 
. (Ans. 
in2)
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