Answer: 90% confidence interval is (25.8,30.2).
Step-by-step explanation:
Since we have given that
n = 5
Mean = 28
Standard deviation = 3
It is a 90% confidence interval , so, z = 1.64
We need to find the interval.
so, it would be
![x\pm z(\dfrac{\sigma}{\sqrt{n}})\\\\=28\pm 1.64\times (\dfrac{3}{\sqrt{5}})\\\\=28\pm 2.2\\\\=(28+2.2,28-2.2)\\\\=(25.8,30.2)](https://tex.z-dn.net/?f=x%5Cpm%20z%28%5Cdfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D%29%5C%5C%5C%5C%3D28%5Cpm%201.64%5Ctimes%20%28%5Cdfrac%7B3%7D%7B%5Csqrt%7B5%7D%7D%29%5C%5C%5C%5C%3D28%5Cpm%202.2%5C%5C%5C%5C%3D%2828%2B2.2%2C28-2.2%29%5C%5C%5C%5C%3D%2825.8%2C30.2%29)
Hence, 90% confidence interval is (25.8,30.2).
Answer:
i might not be correct but 33?
Step-by-step explanation:
Answer:
$30
Step-by-step explanation:
Divide the cost ($75) by the yards (2 1/2) to get $30 per yard.
The left one can be 1, 2, 3, or 4 .
The right one can be 2, 4, 6, or 8.
Their sum can be (2, 4, 6, or 8) plus (1, 2, 3, or 4) .
The smallest possible sum is (2) + (1) = 3 .
The largest possible sum is (8) + (4) = 12 .
And it could be any number in between those.
Select the choice that says this.