How Triangualr formula is applied here

Submitted by aknicet on Fri, 06/21/2013 - 03:45

How B was determined to be the right answer, applying the formulat, the estimate is 13 days?  how these are linked please.

Thanks, 

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PMP / CAPM exam Question bank
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barora@gmail.com

Fri, 06/21/2013 - 04:31

For Three point estimate

Sigma = Standard Deviation = (O-P)/6 = 1 day

Normal Distribution is considered at +/-3 Sigma = 3 days 

With mean of 13 days  and for normal distribution i.e. 3 sigma ... the upper and lower limits would be 10-16 days...which is exactly what the question is asking for ....

and 3 sigma is equal to 99.73%.

 

Regards,

Bhupinder

 

aknicet

Fri, 06/21/2013 - 23:25

Thanks Bhupinder

cnppmp's picture

cnppmp

Fri, 06/21/2013 - 06:05

Simply, calculate


EAD=P+4M+O/6= 16+4(13)+10/6 =78/6= 13 days


 


Since it is normal distribution and  normal distribution, the SD should be considered is +/- 3 Sigma. So, place the 13days, EAD+/- 3= 13+/-3 = 10 and 16 range.


So it falls between 10 & 16.


Regargs


 


CN Patil

aknicet

Fri, 06/21/2013 - 23:26

Thanks CN Patil

sanskrit

Fri, 06/21/2013 - 13:13

 Agree with Bhupinderexplanation