how to attack the Data Sufficiency questions regarding mean, median, range and Standard Deviation. Specially the type where they ask whether mean and median are same?
Thank you
Thank you
The mean and median of a set are are same when,shrutib wrote:...Specially the type where they ask whether mean and median are same?
- 1. All the elements of the set are uniformly distributed (see note) around the mean. For example, {1, 2, 3, 4, 5} or {1, 2, 7, 12, 13} etc.
2. The set contains only one element.
3. All the elements of a set are same.
Edited after the discussion below:
Note : The phrase "uniformly distributed around the mean" may create some confusion. I'm using the phrase "uniformly distributed around the mean" to mean that the first term and last term, second term and second last term, third term and third last term,... n-th term and n-th last term are equidistant from the mean.
For example, the terms of {1, 2, 7, 12, 13} are not equally spaced. But the first term 1 and the last term 13 are equidistant from the mean, i.e. 7. And so are the second term 2 and the second last term 12.
