A student investigated how the current in an unknown electrical component varied with potential difference. The table below shows the results when the potential difference across the component was 8.0 V.
| Potential difference (V) | Current 1st reading (A) | Current 2nd reading (A) | Current 3rd reading (A) | Mean current (A) |
|---|---|---|---|---|
| 8.0 | 0.53 | 0.41 | 0.56 | YYY |
Calculate the mean value YYY.