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

• 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
• 9 years agoHelpfull: Yes(14) No(1)
• therz only written exam on 20th feb
  interviews will be held in between 25th feb to 10th march
• 9 years agoHelpfull: Yes(5) No(0)
• 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:
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• i too dont have any idea about the preparation. am just looking at previously asked questions in various websites.
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• may i know the solution plz
  
• 9 years agoHelpfull: Yes(1) No(0)
• d).
  mean=0
  X = n-mean ,X^2= +ve
  
  sd=sqrt(sumof X=6/6)= 1 ;
  which is more than others.
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• d) diff bet 1st & last is most
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• Hi whether i have my tcs drive on 20th feb...can any one tell me where to prepare (openseesome are m4maths)
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• yes on 20th feb tcs drive is there.
  did you get any mail regarding it???,.
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• ya..i got hall ticket also
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• i cant understand prashant. tell clearly.
  
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• fine. prepare well.
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• Hi Priya,
  Where To prepare ,openseesome are m4maths
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• 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
  
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• does any one have written on 20th at cvr college of engineering
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• i also have fill the form for 20th feb..
  but i didnt get the hall ticket.
  
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• On 20 February is dere only a written test or dey r conducting interview too on dat day only
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• 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
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• i am not able to download the hall ticket for the tcs off campus drive2015.can anyone help?
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• Jeyshri as per my knowledge we can only download the hall ticket before 17 but still u can call them and ask...
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• Mean = (x1+x2+...+x6)/6
  SD= SrRoot( 1/6 * [ x1- Mean]^2+[x2- Mean]^2+...[x6-Mean]^2 )
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