a six-sided die has a 1/6 probability of being rolled, so we assume that the probability question is directed towards rolling dice

we assume that two dice are being rolled

at least one 5 has a (1/6 + 1/6) probability

a sum of 7 requires one of three possibilities: 1+6, 2+5, 3+4

each combination roll has a probability of ((1/6)(1/6))

there are three possible combinations, giving a probabilty of ((1/6)(1/6))*3

the probability of either a sum of 7 or at least one 5:

(1/6 + 1/6) + ((1/6)(1/6))*3

--------------------

probability

--------------------

5/12

As a percentage, 5/12=0.4116, which is approximately 41%.