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2 questions from Dimensionality Reduction

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Question 1: Short answer

mediumAI-checkedDimensionality Reduction

PCA on six standardized features gives the covariance eigenvalues 5.2, 2.1, 1.1, 0.8, 0.5, 0.35.2,\ 2.1,\ 1.1,\ 0.8,\ 0.5,\ 0.3. What is the smallest number of components kk whose cumulative explained variance is at least 90%?

a whole number of components