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How do you correctly compute the mean of a NumPy array data along the second axis?

easy📝 Syntax Q3 of 15
NumPy - Aggregation Functions
How do you correctly compute the mean of a NumPy array data along the second axis?
Anp.mean(data, axis=2)
Bnp.mean(data, axis=0)
Cnp.mean(data, axis=1)
Dnp.mean(data, axis=-1)
Step-by-Step Solution
Solution:

  1. Step 1: Identify axis

    Axis 0 is rows, axis 1 is columns in 2D arrays.

  2. Step 2: Mean along second axis

    To average across columns (second axis), use axis=1.

  3. Final Answer:

    np.mean(data, axis=1) -> Option C

  4. Quick Check:

    Axis 1 means across columns [OK]
Quick Trick: Axis 1 means columns in 2D arrays [OK]
Common Mistakes:
  • Using axis=0 instead of axis=1
  • Using invalid axis values

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