Are such questions asked in the exam

 I am giving mock test and come across some questions which I feel wont be asked in the real exam, can anyone please confirm and try to solve this question.

1. Which of the following will not be a probability function?

a) X (1,2,3,4,5) p(x) = x/15

b) X (1,2,3,4,5) p(x) = 0.2

c) X (1,2,3,4,5) p(x) = (x*x)/55

d) X (1,2,3,4,5) p(x) = (10-x)/10


I am adding one more question which i encountered in the mock test, can u tell me if uch questions are asked.

2. Event B&C are mutually exclusive & exhaustive P(B) = 0.3 & P(C) - 0.5. If probability of A given B is 0.6 and probability of A given C is 0.2, what is the unconditional probaility of A?

a) 15 % b) 10 % c) 18 % d) 28 %



3. Does anyone knows what is stratified random sampling and if any questions related to such topics are asked.


5) Any questions where we need to calculate  working capital are asked?



admin's picture

No, PMP is not a test of your math skills :)

Answer is B, always function P(x)  will be = 0.2. It is certain.

 but this question is asking which one will not be?

Which is certain or 100% to happen - means NO probability

 The answer which is mentioned is (d)


Explaination: In order to  be a probability distribution function , the sum of probabilities must equal 1.

admin's picture

I dont think we have such questions in PMP. Where did you find these questions.

Cert Gear Mock test. 

I agree with Admin. PMP Exam is not a "torture" exam hehe! nor a Board Exam for Engineers. Some mock tests are so not realistic. Some use their own invented terms, that no one could even find in the PMBOK Glossary, nor in PM Glossary of terms. What a waste of time dealing with those kind of questions, or mock tests.

Let see what PMBOK says

There is a substantial body of knowledge on statistical sampling. In some application areas it may be necessary for the project management team to be familiar with a variety of sampling techniques to assure the sample selected actually represents the population of interest.


The project management team should have a working knowledge of statistical quality control, especially sampling and probability, to help evaluate quality control outputs. Among other subjects, the team may find it useful to know the differences between the following pairs of terms:


Though I am also in favor that students should not go in deep or detail , but elementry and conceptual knowledge gained.


Not only this there are many maths questions and subject knowledge questions are there, which are hardly asked.

But When i personally asked to Customer Care regarding such questions- they replied simply- refer hand book and for subject content one more handbook - 


Your Q 2 is - incomplete and incorrect.

Q 3 and 5 - refer google search or any search engine.

 The answer to question 2 is d) 28%.


explaination given is P(A) = P (A|B) + P(B) + P (A|C) * P (C)

                                               = (0.6x0.3) + (0.2x0.5)

                                                = 0.28


I am very weak in Maths and such question just bounces over my head, thats why I asked if such questions are asked in exam or not

 Hi, believe me i haven't seen such question in the PMP exam. It looks like testing your "mathematics" skill. Please avoid such questions for PMP.

what is the source.

I also believe Q 1 can be a possibility but Q2 is not like that, at this I agree with karlene . ( if you are talking OF PMP)

Q3 and 5 is general .

if you are able to solve all evm emv network make-buy and commu. and all included in Rita or Andy or HF or Scordo or any source so far on this forum, then no one can stop you .

I think you are approching something ahead of this all.

I again repeat go conceptual and elementary - around pmbok and refer previous notes.

if you are preparing upto 90%, above guideline is okay.

if you are thinking of 95-99 then such type of q may be dealt.

In Q 2 one mistake is of minus sign , i think it is =, I firmly advice - leave such q. there are lots of to read other than such overhelming deeper knowledge areas.

I totaly agree with u and now when am encountering such questions in the mock test, i just guess, mark and move to next.

The source is CERT GEAR MOCK TEST, I am taking this mock exam from the institute where I did my PMP coachng. 




we can understand in simplified manner Q 2 :

Mutually exclusive outcomes or events or samples  -- I think you know what it is, it is given in Andy and other books. Its meaning is out of 2 samples only 1 will happen at a time and other one will not happen.

Exhaustive samples - nothing but its meaning is - at least one of the samples must occur out of given set of samples,

for example head and tail.

when you toss a coin - either head will come or tail will come -- so these (H and T ) are mutually exclusive.

And atleast one event (or sample or outcome ) will always happen either head or tail -- hence these are exhaustive.


In Q  out of event B and C , only one -- either B or C will happen .

so probability of A is depends on B and it will be 0.5 of C. and probability  of C is given =0.2 ,

hence probability of A will be 0.5*0.2 =  0.10 when C event happens.

and thus probability of A will be 0.6*0.3= 0.18 when B event happens.

Hence total probability of happening A will be P(B) +P(C) = 0.28

What is answer given - is in mathematical notations.

P(A) = P (A|B) * P(B) + P (A|C) * P (C)


you have done in rita such questions  probability of risk A is 30% and probability of risk B is 60% , what is probability that both risk will occur --- 0.3*0.6 = 0.18 (18%), it is just like of that.

Good explaination.

But I am not very good in prob and statistics and want to keep away from such questions. :-)