A cold-storage sensor missed some readings (stored as nan). Store how many readings are missing in result.
import numpy as np temps = np.array([31.5, np.nan, 33.0, 34.2, np.nan, 32.8, 30.9, np.nan, 29.5])
Store your final answer in a variable named result.
Each hint gives a little more help. Try on your own first.
Run your code to see the output here.