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Following table provides information on standard deviations of Principal Component Analysis on a certain dataset. There are 15 variables in the data and PCA is

Following table provides information on standard deviations of Principal Component Analysis on a certain dataset. There are 15 variables in the data and PCA is run on scaled data.

	PC1	PC2	PC3	PC4
Stdev	2.3	2.1	1.5	0.960

What is the proportion of total variability explained by the 4 PCs?

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