0 0 Bài 3: Cho biết khối lượng của một loại sản phẩm tuân theo luật phân phối chuẩn N(I, J). Cân thử
từng sản phẩm của một mẫu ngẫu nhiên gồm 25 sản phẩm, ta có kết quả sau:
Khối lượng
29,3
29,7
30
30,5
30.7
Số sản phẩm
4
5
8
5
3
Biết rằng phương sai của biển ngẫu nhiên là = 0,2. Hãy tìm khoảng tin cậy của trung bình khối
lượng sản phẩm với độ tin cậy 95%.​

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

b

step-by-step explanation:

if you was gonna solve for a, a is a   < -12