To determine how many times you would expect to select the card labeled "5" after repeating the experiment of selecting a card from a deck of 10 cards labeled 1-10 a total of 120 times, we can use the concept of expected value.
In a single selection, the probability of selecting the card labeled "5" is \( \frac{1}{10} \) since there is one favorable outcome (selecting card 5) out of 10 possible outcomes (cards 1 through 10).
If you repeat the experiment 120 times, the expected number of times you select card 5 is given by:
\[ \text{Expected number of times} = \text{total trials} \times \text{probability of selecting card 5} \]
\[ \text{Expected number of times} = 120 \times \frac{1}{10} = 12 \]
Therefore, you would expect to select the number 5 a total of 12 times.
So, the correct response is 12.