2. Give some practical uses of knowing variation. 3. For many years, the New York subway had no air conditioning on the grounds that the average trip was only 15 minutes, and 15 minutes without air...

Please answer questions 2 and 3 thank you


Extracted text: 2. Give some practical uses of knowing variation. 3. For many years, the New York subway had no air conditioning on the grounds that the average trip was only 15 minutes, and 15 minutes without air conditioning is no hardship, even in the New York summer. Critique this reasoning.