Answer:
V = π6²6 - (1/3)π6²6
Step-by-step explanation:
Volume of a cone is (1/3) that of a cylinder with the same radius and height.
Container A volume is the volume of a cylinder minus a cone.
V = πr²h - (1/3)πr²h
V = π6²6 - (1/3)π6²6
V = 144π units³
Unit rate if your finding how much one cost.
We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.
The formula we use is

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99
Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.
Using the z-score, our standard deviation (9) and our margin of error (3), we have: