APARTMENTS Floors .............1 bed room ..............2 bedroom ...............3rd bedroom ................TOTAL 1st ...................3 ................................1................................. 1..................................... 5 2nd .................1................................. 3 ................................2..................................... 6 3rd .................1 ..................................4 ...............................1 .....................................6 TOTAL ............5................................. 8............................... 4................................. 17

Things to do before you begin Make sure that sum of all rows are computed (horizontal ) An apartment building has the above distribution of apartments: If an apartment is selected at random, what is the probability that it is on the 2nd floor or has 2 bedrooms?