St1 is clearly INSUFF
But please clear my doubts about St2.
One SD away form the mean covers 68.2% of the values.
Two SD away form the mean covers 95.4% of the values.
Let mean = x
Two SD away on lower side = x-1000
Two SD away on upper side = x+1000
So range will be greater than x+1000 - (x-1000) = 2000 irrespective of value of mean.
SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008