Step-by-step explanation:
what do you actually do with the cards ? what do you expect to see ? and what exactly do you need out of all this ?
the second part of the question is not really understandable.
I assume you need to calculate the probability that the pulled card is gray, and the probability that the card is not gray.
a probability is always
desired cases / total possible cases
we have 8 cards.
so, the total possible cases for pulling a card are 8.
3 of these 8 cards are gray.
the other 5 cards are white.
so, the probability to pull a gray card is
3/8 = 0.375
the probability to pull a white (= not gray) card is
5/8 = 0.625
fun fact : because both possible events together describe everything that can happen in the experiment, the probability of each event is the opposite of the probabilty of the other event.
e.g.
the probability of the opposite of pulling a gray card (= not pulling a white one) is
1 - 3/8 = 1 - 0.375 = 0.625 = 5/8
and the probability of the opposite of pulling a white card (= not pulling a gray one) is
1 - 5/8 = 1 - 0.625 = 0.375 = 3/8