[R] Using R for grouped data based calculations ???

[Amit Jain]

Hi,

Has Anyone used R for descriptive statistics of Grouped Data. I have
an example below

Can someone calculate the Median of the following data using R

Miles Driven             Number of Residents
0-2999                           10
3000-5999                     28
6000-8999                     46
9000-11,999                  32
12,000-14999                24
15000-19,999                 11
20000 and over                7

what is the median number of miles driven per resident for this sample using R

I can do this manually but I need to figure out this can be done using
R. I am not looking for an exact solution to this but to some pointers
or a nice example

thanks
-amit