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friskisthebest1
15.06.2021 •
Mathematics
Hãng sơn Dulex công bố thời gian khô trung bình củ một loại sơn mới là 11,5 phút với độ lệch tiêu chuẩn là 3,4. Để đánh giá thông tin này có chính xác hay không, người ta thu nhập số liệu về thời gian khô ( phút) của 50 thùng sơn được lựa chọn ngẫu nhiên. Kết quả tính toán cho thấy thời gian chờ khô trung bình là 10,8 phút. Với mức ý nghĩa 2%. Công bố của công ty có chính xác không?
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Ответ:
its 21
because ●=10 and °=1
●+●=20
●+●=20+°
●+●+°=21
jordie is spelled
J-O-R-D-I-E
j-o-r-d-i-e
hope this helps :)