In a certain instant lottery game, the chances of a win are stated as "7 in 19." express the indicated degree of likelihood as a probability value between 0 and 1. what is the probability?

All probabilities can be represented not just as a ratio (like 7/19) but as a decimal between 0 and 1. We can do this simply by dividing. (and of course that makes it between 0 and 1 because you can't have the numerator be larger just like you can't have more success than total chances) 0 = no chance, 1 = 100% chance, and then there's everything inbetween...