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.
Answers: 1
Mathematics, 21.06.2019 19:40
Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.
Answers: 3
Mathematics, 21.06.2019 23:00
Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?
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Mathematics, 22.06.2019 04:00
In a recent year, the weather was partly cloudy 2/5 of the days. assuming there are 356 days in a year, how many days were partly cloudy?
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Mathematics, 22.06.2019 04:30
An angle bisector ac divides a trapezoid abcd into two similar triangles ? abc and ? acd. find the perimeter of this trapezoid if the leg ab=9 cm and the leg cd=12 cm.
Answers: 3
Trong một cuộc khảo sát 64 khách hàng ở một tiệm ăn nhanh, thời gian đợi trung bình là 3 phút
và độ...
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