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Which of the following is the correct syntax to calculate the mean of a numpy array arr?

easy📝 Syntax Q12 of 15
NumPy - Aggregation Functions
Which of the following is the correct syntax to calculate the mean of a numpy array arr?
Aarr.mean()
Bmean(arr)
Cnumpy.mean(arr)
Darr.average()
Step-by-Step Solution
Solution:

  1. Step 1: Recall numpy array methods

    Numpy arrays have a method called mean() to calculate average.

  2. Step 2: Check syntax correctness

    Calling arr.mean() is correct; mean(arr) is invalid without import, numpy.mean(arr) requires prefix, arr.average() does not exist.

  3. Final Answer:

    arr.mean() -> Option A

  4. Quick Check:

    Array method for mean = arr.mean() [OK]
Quick Trick: Use array.method() for aggregation in numpy [OK]
Common Mistakes:
  • Using mean(arr) without numpy prefix or import
  • Using arr.average() which is not a numpy method
  • Confusing function and method syntax

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