data suff

**kaushikt** · 10-12-2007, 01:43 PM

A has 10 numbers, is the SD of A = 0?
1) The average of set A = 15
2) The least number in A is 2

**eltonr** · 10-12-2007, 01:57 PM

IMO,
it is B

Since the least number in A is 2, that means others are greater than 2, which implies there is variance among them. Hence std deviation cannot be 0

From 1, all the 10 numbers could be 15, as a result std deviation would be 0

Elton

**prreeet** · 10-12-2007, 07:00 PM

Originally Posted by eltonr

IMO,
it is B

Since the least number in A is 2, that means others are greater than 2, which implies there is variance among them. Hence std deviation cannot be 0

From 1, all the 10 numbers could be 15, as a result std deviation would be 0

Elton

Sounds logical...
So if we have all the numbers as 2, cann't we make a statement - least number is 2. In case we can - then my answer would be C

**Artemov** · 10-13-2007, 10:58 AM

I think A.
Set A will have diff. nos. So, SD#0.
What is the Official Answer?

**nikiforos** · 10-13-2007, 11:53 AM

good qn

**ken_english** · 10-15-2007, 12:10 AM

I would go with C

**chandak_anand** · 10-18-2007, 04:09 AM

Yes C for me too
1) The average is 15 , so all the 10 number can be 15 or something else.-> Insuff
2) The least number is 2. But again all of them can be 2 or greater than 2 -> Insuff
But if u combine the 2 i.e least number is 2 and average 15 than yes u can say that there is some variation among number and SD !=0