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Railways NTPC (Technical Ability) Instrument Mechanical Question Bank Instrument Mechanical

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    In a PERT network, expected project duration in found to be 36 days from the start of the project. The variance is four days. The probability that the project will be completed in 36 days is?

    A) Zero                             

    B) 34%

    C) 50%                             

    D) 84%

    Correct Answer: C

    Solution :

    \[{{T}_{e}}=\]36 days, \[\sigma =\sqrt{4}=\]2 days, \[{{T}_{s}}=36\,\,days\] \[z=\frac{{{T}_{s}}-{{T}_{c}}}{\sigma }=\frac{36-36}{2}\,0\] For z = 0, P=50%


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