Answer:

Step-by-step explanation:
Given : . The manufacturer of a refrigerator system for beer kegs produces refrigerators that are supposed to maintain a true mean temperature, 48°F, ideal for a certain type of German pilsner.
To Find : The owner of the brewery does not agree with the refrigerator manufacturer, and claims he can prove that the true mean temperature is incorrect.
Solution:
We are given that refrigerators that are supposed to maintain a true mean temperature, 48°F.
Claim : The true mean temperature is incorrect.
So, null hypothesis and alternate hypothesis will be :

So, Option D is true .
The volume should be l(w)(h)= v so 6.3(14.7)(8.4)=29.4 in