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CMA Intermediate · Financial Management and Business Data Analytics · Introduction to Data Science for Business Decision-making

Mehta Retail has 5,000 customer records collected for a churn model. During preparation, 400 records have missing income and 100 are exact duplicates; the analyst deletes the duplicates and drops all records with missing income. Assuming no overlap between the two groups, how many records remain for modelling?

4,500 records remain. The analyst removes 100 duplicate records and 400 records with missing income, and since the two groups do not overlap, 5,000 minus 500 leaves 4,500 clean records available for building the model.

  1. A4,500Correct
  2. B4,600
  3. C4,900
  4. D5,000

Explanation

Records with duplicates: 100; records with missing income: 400; no overlap. Remaining = 5,000 - 100 - 400 = 4,500. 4,600 deletes only the missing-income records and ignores the duplicates, and 4,900 deletes only the duplicates.

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