In a standard deck of 52 playing cards what is the probability of drawing an ace on the first draw?

Probability =

(number of possible successes) / (total number of possible outcomes).

Possible successes = 4 (aces)

Total possible outcomes = 52 (cards)

Probability of drawing an ace from a full deck =

(4 / 52) = (1 / 13) = 7.69% (rounded)