Railways Technical Ability Instrument Mechanical Question Bank Instrument Mechanical

  • question_answer The variance \[\left( {{V}_{1}} \right)\] for critical path \[a\to b=4\] time units, \[b\to c=16\] units, \[c\to d=4\] time units,      \[d\to e=1\] time unit. The standard deviation of the critical path \[a\to e\] is:

    A) 3                                 

    B) 4

    C) 5                                 

    D) 6

    Correct Answer: C

    Solution :

    \[\sigma =\sqrt{\sum{\text{variance}}}\] \[=\sqrt{4+16+4+1}=\sqrt{25}=5\]

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