Chọn ngẫu nhiên 110 sinh viên trong cùng một trường và đo chiều cao của họ thấy có 11 sinh viên có chiều cao 170cm. hãy ước lượng số sinh viên tối thiểu có chiều cao trên 170cm của trường này với độ tin cậy 97%. biết rằng ở thời điểm khảo sát trường này có 10.000 sinh viên.
a. Xác định rõ dạng bài toán suy diễn thống kê
b. Xác định các công thức cần sử dụng
c. Giá trị của các số đặc trưng mẫu? Giá trị tra bảng phân phối chuẩn hóa?
d. kết quả?
Answers: 2
Physics, 21.06.2019 22:10
The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.
Answers: 2
Physics, 22.06.2019 00:10
A-of 75 cm by cm by 17.5 cm up. of is 2 kg a , in ,if it is in , kg/?
Answers: 1
Physics, 22.06.2019 03:30
Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)
Answers: 1
Physics, 22.06.2019 06:00
Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)
Answers: 2
Chọn ngẫu nhiên 110 sinh viên trong cùng một trường và đo chiều cao của họ thấy có 11 sinh viên có c...
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