Out of the 36 ( 6 x 6 ) possibilities, the number of possibilities that favour the required event are,

( if the event mentioned here only means that the sum of the digits should be = 5 and not greater than or equal to 5 or smaller than or equal to 5 )

1,4

2,3

3,2

4,1

i.e., there are 4 events out of 36 in favour of the required event. Therefore the probability is 4/36 = 0.1111 or 11.11%