GMATMadeeasy wrote:

Both the ranges of 2 lists are from 1 to 100, whose deviation is greater?

1) List 1 has three 100 and two 50; List 2 has two 100 and three 50.

2) The averages are the same.

One alone can not help : We can have list of numbers in any fashion as only range has to be within limit of 100 . not sufficent

Obviously two alone is not adequate to answer the question a well . If mean are same , does not mean anything for SD unless you know the variation of its elemnt from the mean. not sufficient.

Is it possible to answer if one and two are together ? Answers with explanations only please.

The wording of this question is terrible - where is it from? The 'range' of a set is a single number, the difference of the largest and smallest elements. We don't say that 'the range is from 1 to 100'; that's misusing terminology. The term 'deviation' in statistics is also not interchangeable with 'standard deviation'; the 'deviation' of an element x is the difference between x and the mean. It's meaningless to talk about the deviation of a list. I'm sure the question means to discuss standard deviation instead. If so, the answer is certainly E; we have almost no information about how the elements in the lists are distributed.

_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com