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There are 5000 observations in a data set. 10% of the data are 1s, while the rest are 0s. If we oversample 1s to 50%,

There are 5000 observations in a data set. 10% of the data are "1"s, while the rest are "0"s. If we oversample "1"s to 50%, how many data points will be excluded from the analysis? Assume that the original percentages of "1" and "0" are restored in the validation data. Show all calculations.

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