Latest TCS Aptitude Question SOLUTION: Which of the following set of numbers has the highest Standard deviation? a)1,0,1,0,1,0 b) -1, -1, -1, -1, -1, -1 c)1,1,1,1,1,1 d) -1,1,-1

• Placement Papers
• /
• TCS
• /
• Numerical Ability
• /
• Number System

TCS Question Papers: TCS Interview Experience(90) TCS Company Profile

(#M40115096) TCS Numerical Ability question Keep an EYE

Which of the following set of numbers has the highest Standard deviation?
a)1,0,1,0,1,0 b) -1, -1, -1, -1, -1, -1
c)1,1,1,1,1,1 d) -1,1,-1, 1,-1, 1

Asked In TCS PRIYA (9 years ago)

Unsolved Read Solution (21)

Is this Puzzle helpful?   (5)   (3) Submit Your Solution Number System

Read Solution (21) :

Kaifi  (9 years ago)

Ans: d) -1,1,-1,1,-1,1

Solving Standard Deviation:
a) Data values=1,0,1,0,1,0
step 1: find mean.. (1+0+1+0+1+0)/6=3/6=1/2
step 2: subtract mean from each data value.. 1-1/2, 0-1/2, 1-1/2, 0-1/2, 1-1/2, 0-1/2= 1/2,-1/2,1/2,-1/2,1/2,-1/2
step 3: square it.. 1/4,1/4,1/4,1/4,1/4,1/4
step 4: add squares= 6/4=3/2
step 5: sub 1 from n number of values.. n-1= 6-1=5
step 6: divide square(step 4)/n-1= (3/2)/5= 3/10=0.3
standard deviation= 0.3

likewise calculate for each..
b)sd=0
c)sd=0
d)sd=6/5=1.2
highest sd for this set of numbers is 1.2

Is this solution Helpfull? Yes (14) | No (1)  

umabhargavi  (9 years ago)

therz only written exam on 20th feb
interviews will be held in between 25th feb to 10th march

Is this solution Helpfull? Yes (5) | No   

pallavi  (9 years ago)

Step 1. Work out the mean. In the formula above μ (the greek letter "mu") is the mean of all our values ... ...
Step 2. Then for each number: subtract the Mean and square the result. ...
Step 3. Then work out the mean of those squared differences. ...
Step 4. Take the square root of that:

Is this solution Helpfull? Yes (2) | No   

PRIYA  (9 years ago)

i too dont have any idea about the preparation. am just looking at previously asked questions in various websites.

Is this solution Helpfull? Yes (1) | No   

vinay kumar siddanatham  (9 years ago)

may i know the solution plz

Is this solution Helpfull? Yes (1) | No   

Chandan Sharma  (9 years ago)

d).
mean=0
X = n-mean ,X^2= +ve

sd=sqrt(sumof X=6/6)= 1 ;
which is more than others.

Is this solution Helpfull? Yes (1) | No   

prashant kumar  (9 years ago)

d) diff bet 1st & last is most

Is this solution Helpfull? Yes | No (2)  

Prabu   (9 years ago)

Hi whether i have my tcs drive on 20th feb...can any one tell me where to prepare (openseesome are m4maths)

Is this solution Helpfull? Yes | No   

PRIYA  (9 years ago)

yes on 20th feb tcs drive is there.
did you get any mail regarding it???,.

Is this solution Helpfull? Yes | No (1)  

Prabu   (9 years ago)

ya..i got hall ticket also

Is this solution Helpfull? Yes | No   

PRIYA  (9 years ago)

i cant understand prashant. tell clearly.

Is this solution Helpfull? Yes | No   

PRIYA  (9 years ago)

fine. prepare well.

Is this solution Helpfull? Yes | No   

Prabu   (9 years ago)

Hi Priya,
Where To prepare ,openseesome are m4maths

Is this solution Helpfull? Yes | No (1)  

Jaydev Dinda  (9 years ago)

The answer is b)-1,-1,-1,-1,-1,-1 ...for this sequence Standard deviation is 2.
how to find out Standard deviation of a finite set of number please follow below link
http://en.wikipedia.org/wiki/Standard_deviation

Is this solution Helpfull? Yes | No (1)  

ARAVIND  (9 years ago)

does any one have written on 20th at cvr college of engineering

Is this solution Helpfull? Yes | No (1)  

Ankit vijaybhai patel  (9 years ago)

i also have fill the form for 20th feb..
but i didnt get the hall ticket.

Is this solution Helpfull? Yes | No   

Kritika dhingra  (9 years ago)

On 20 February is dere only a written test or dey r conducting interview too on dat day only

Is this solution Helpfull? Yes | No   

mamatha spandana parakula  (9 years ago)

a -> deviate with -1,1
b ,c -> deviate with 0
d -> deviate with 2,-2 so highest standard deviation is 2,-2
so "d " is ans => -1,1,-1,1-1,1 is ans

Is this solution Helpfull? Yes | No   

jeyshri  (9 years ago)

i am not able to download the hall ticket for the tcs off campus drive2015.can anyone help?

Is this solution Helpfull? Yes | No   

Kritika dhingra  (9 years ago)

Jeyshri as per my knowledge we can only download the hall ticket before 17 but still u can call them and ask...

Is this solution Helpfull? Yes | No   

SAIRAM TATIKONDA  (9 years ago)

Mean = (x1+x2+...+x6)/6
SD= SrRoot( 1/6 * [ x1- Mean]^2+[x2- Mean]^2+...[x6-Mean]^2 )

Is this solution Helpfull? Yes | No   

Please Login to Read Solution.