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National Instruments Interview Question for Software Engineer / Developers


Country: India
Interview Type: Written Test



Comment hidden because of low score. Click to expand.
4
of 4 vote

The probability one person hit the stump twice is E(X) = P^2

Assume that n people (n= 5) are n independent variables (the result from one does not influence result of the others) then the expected number of people who hit both time is
E(X1) + E(X2) + .. E(Xn) = n E(X) = n * P^2

Quick validation if P = 1, always hit, and all the people hit twice then there are 5 people hit
P = 0, always failed, non-of-them hit, then we expect 0 as the result

- LinhHA05 July 24, 2013 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

I think the probability will become greater than 1 when P=0.5

- martin1990 July 24, 2013 | Flag
Comment hidden because of low score. Click to expand.
1
of 1 vote

The question is how many person, that is why the result can be greater than 1. In term of the probability for one person to hit twice, it is always less than 1 : P^2 <= P <= 1.0

- LinhHA05 July 24, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

I think one person hitting ball is p^2(2*(1-p)*p+(1-p)*(1-p)) since no others must hit ball twice

- Bala Sravan July 25, 2013 | Flag
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0
of 0 votes

Why not n(1-(1-p)^2) ??

- sravan October 23, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

n*(p^2) will give how many people will hit the stumps twice in there turn .

- rinku goel January 31, 2015 | Flag
Comment hidden because of low score. Click to expand.
0
of 2 vote

Ans is 5*P*P

- loveCoding July 24, 2013 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

no of events = pp,(1-p)p, (1-p)(1_p)
so , 1/3;
for five persons = 5*3=15;
both times hitting= 5/15 = 1/3;
so three persons will hit both times........

- lakshmipriya August 16, 2013 | Flag Reply
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0
of 0 vote

one person has a possibilities to hit a stump=1/3
possibilities are (hh,h(1-h),(1-h)(1-h))
so for 5 people possibilities is 5/3

- kundan kumar January 22, 2015 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

CodingTonic . blogspot . com

- Abhinav January 26, 2015 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

codingtonic.blogspot.in/2015/01/national-instruments-interview.html

- abhinav January 26, 2015 | Flag Reply


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