Final answer:
The probabilities for various events when drawing a card from a standard deck can be calculated by dividing the number of favorable outcomes by the total number of possible outcomes.
Step-by-step explanation:
a) The probability of choosing a 2 of spades from a standard deck of cards is 1/52, because there is 1 card that is a 2 of spades out of a total of 52 cards.
b) The probability of choosing a heart from a standard deck of cards is 1/4, because there are 13 hearts out of a total of 52 cards.
c) The probability of choosing a 7 or a jack from a standard deck of cards is 8/52, because there are 4 sevens and 4 jacks out of a total of 52 cards.
d) The probability of choosing a face card from a standard deck of cards is 12/52, because there are 12 face cards (kings, queens, and jacks) out of a total of 52 cards.
e) The probability of choosing a black 10 from a standard deck of cards is 2/52, because there are 2 black 10s (10 of spades and 10 of clubs) out of a total of 52 cards.
f) The probability of choosing a red card or an ace from a standard deck of cards is 20/52, because there are 26 red cards and 4 aces out of a total of 52 cards.