Dr. Marcus Wright, a machine learning engineer, trains a diagnostic model on 2,400 medical images. If 60% are labeled as normal, 30% as benign, and 10% as malignant, and he splits the data into training, validation, and test sets in a 7:2:1 ratio, how many malignant images are in the test set?

Wed, 15 Apr 2026 22:57:13 +0000

**How Dr. Marcus Wright, a machine learning engineer, trains a diagnostic model on 2,400 medical images. If 60% are labeled as normal, 30% as benign, and 10% as malignant, and he splits the data into training, validation, and test sets in a 7:2:1 ratio, how many malignant images are in the test set?** In an era where artificial intelligence is rapidly transforming healthcare diagnostics, Dr. Marcus Wright stands at the intersection of cutting-edge technology and clinical precision. His work involves training a diagnostic machine learning model using 2,400 medical images, reflecting the diversity of real-world cases. With 60% of the images labeled normal, 30% as benign conditions, and only 10% classified as malignant—highlighting just how rare serious findings are—this rare distribution demands careful data handling. Engineers like Dr. Wright must balance clinical relevance with statistical rigor, especially when preparing data for testing, to ensure models deliver accurate, reliable results. How Dr. Marcus Wright, a machine learning engineer, trains a diagnostic model on 2,400 medical images. If 60% are labeled as normal, 30% as benign, and 10% as malignant, and he splits the data into training, validation, and test sets in a 7:2:1 ratio, how many malignant images are in the test set? By dividing the 10% malignant category across the test split, a key step ensures the model is evaluated on a representative sample of rare cases—critical for real-world reliability. Using the 7:2:1 training, validation, and test split on 2,400 images, the total parts equal 10. The test set holds 10% of 2,400: 240 images. Since 10% of the full dataset is malignant, the test set contains 10% of 240, which is 24 malignant images. This precise calculation reflects the integrity Dr. Wright applies to model readiness, minimizing bias and supporting accurate performance validation.