cam6877
19.06.2021 •
Mathematics
Kiểm tra ngẫu nhiên 16 bóng đèn loại A tính được tuổi thọ trung bình của chúng là 1200(giờ) và độ lệch chuẩn mẫu s=26.094 giờ. Giả sử tuổi thọ của bóng đèn loại A là biến ngẫu nhiên có phân phối chuẩn. Biết t(15;0.025)=2.13. Với độ tin cậy 95%, tìm khoảng tin cậy đối xứng cho tuổi thọ trung bình của bóng đèn loại A
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