# TASK: Identify the mask for ‘Valid’ data (where status_codes is NOT 3 — Faulty/Missing).
valid_data_mask = (status_codes != 3)

# TASK: Calculate the median temperature ONLY for the Valid data points. This is our imputation value.
valid_median_temp = np.median(temperature_data[valid_data_mask])
print(f”Median of all valid readings: {valid_median_temp:.2f}°C”)