A spinner is spun 100 times. The results are shown in the table below. Calculate the experimental probability of spinning an 8, a 5, and a 7.

The total number of trials is 100. The sum of all successful outcomes must equal the total number of trials.

$$q + 18 + 15 + 16 + 12 + 7 + 10 + 13 = 100$$ $$q + 91 = 100$$ $$q = 100 - 91$$ $$q = 9$$

The number of successful outcomes for spinning an 8 is 13. The total number of trials is 100.

$$P(\text{spinner spins an 8}) = \frac{\text{Number of times 8 was spun}}{\text{Total number of trials}}$$ $$P(\text{spinner spins an 8}) = \frac{13}{100} = 0.13$$

As a percentage: $0.13 \times 100\% = 13\%$
The experimental probability is $\boxed{\text{0.13 or 13\%}}$.

The number of successful outcomes for spinning a 5 is 12. The total number of trials is 100.

$$P(\text{spinner spins a 5}) = \frac{\text{Number of times 5 was spun}}{\text{Total number of trials}}$$ $$P(\text{spinner spins a 5}) = \frac{12}{100} = 0.12$$

As a percentage: $0.12 \times 100\% = 12\%$
The experimental probability is $\boxed{\text{0.12 or 12\%}}$.

The number of successful outcomes for spinning a 7 is 10. The total number of trials is 100.

$$P(\text{spinner spins a 7}) = \frac{\text{Number of times 7 was spun}}{\text{Total number of trials}}$$ $$P(\text{spinner spins a 7}) = \frac{10}{100} = 0.10$$

As a percentage: $0.10 \times 100\% = 10\%$
The experimental probability is $\boxed{\text{0.10 or 10\%}}$.

This means spinning a 1 OR spinning a 4.
The number of successful outcomes for spinning a 1 is 9.
The number of successful outcomes for spinning a 4 is 16.
The total number of successful outcomes for spinning 1 or 4 is $9 + 16 = 25$.
The total number of trials is 100.

$$P(\text{spinner spins 1 or 4}) = \frac{\text{Number of times 1 or 4 was spun}}{\text{Total number of trials}}$$ $$P(\text{spinner spins 1 or 4}) = \frac{25}{100} = 0.25$$

As a percentage: $0.25 \times 100\% = 25\%$
The experimental probability is $\boxed{\text{0.25 or 25\%}}$.