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Mathematics, 22.07.2021 06:20 ayoismeisalex

Trong một cuộc khảo sát 64 khách hàng ở một tiệm ăn nhanh, thời gian đợi trung bình là 3 phút và độ lệch chuẩn là 1,5 phút. Với độ tin cậy 98%, tìm khoảng tin cậy cho thời gian đợi phục vụ
trung bình của tiệm ăn này. Biết thời gian đợi phục vụ là biến ngẫu nhiên có phân phối (xấp xỉ)
chuẩn.

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