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

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Manager
Joined: 12 Sep 2006
Posts: 83
Followers: 1

Kudos [?]: 5 [0], given: 0

I found a similar ques in one of the threads but did not [#permalink]  16 Feb 2007, 14:44
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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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SVP
Joined: 01 May 2006
Posts: 1798
Followers: 8

Kudos [?]: 102 [0], given: 0

(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
Joined: 12 Sep 2006
Posts: 83
Followers: 1

Kudos [?]: 5 [0], given: 0

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.. just a curious silly ques.
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