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A study at a college in the west coast reveals that, historically, 45% of the students...

A study at a college in the west coast reveals that, historically, 45% of the students are minority students. If random samples of size 75 are selected, 80% of the samples will have less than ____ % of minority students. Can you explain thoroughly? I don't understand about this equation P80=P+2st.dev error.

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