To find the expected number of times the number 5 will be selected when the experiment is repeated 120 times, we can use the concept of expectation.
The probability of selecting the number 5 from a deck of 10 cards (labeled 1 to 10) is \( \frac{1}{10} \).
When the experiment is repeated 120 times, the expected number of times number 5 will be selected can be calculated as:
\[ \text{Expected selections} = \text{Number of trials} \times \text{Probability of success} = 120 \times \frac{1}{10} = 12 \]
Thus, you would expect to select the number 5 a total of 12 times.
So the correct response is: 12