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I found a similar ques in one of the threads but did not

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I found a similar ques in one of the threads but did not [#permalink] New post 16 Feb 2007, 15:44
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I found a similar ques in one of the threads but did not follow it. What do we need to find in this ques? Please explain your answer.
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 [#permalink] New post 16 Feb 2007, 16:00
(D) for me :)

A number included in a standard deviation is included betwen (average - deviation) and (average + deviation).

Therefore here, we have 99,7 and 10,3. Then, we count all numbers between those 2 limits.

o 9,9 : 3 numbers
o 10 : 1 number
o 10,2 : 2 numbers

So,
Purcentage = 6/8*100 = 75 :)
Manager
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 [#permalink] New post 16 Feb 2007, 17:41
So this is about 1 Standard Deviation of the Mean. I follow that.

Fig wrote:
A number included in a standard deviation is included betwen (average - deviation) and (average + deviation).


Is there anything like '2 Standard Deviation of Mean'? Geeezz.. :lol: just a curious silly ques.
  [#permalink] 16 Feb 2007, 17:41
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