Macgregor main purpose in providing the quote is to

MacGregor’s main purpose in providing the quote is to explain why only the upper classes could afford to drink tea.

Explanation:

Express his viewpoint on the importance of drinking tea often. illustrate how celebrities preferred their tea with sugar and milk. support his statement that people locked away their tea like it was a drug.

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even though there may be variations in human emotions over time, the poem “ a contribution to statistics” by wislawa symborska suggests that the only unchangeable characteristic is mortality.

the author poses a distinction between the approximate and non-approximate numbers which correspond to our need for certainty in life and the difficulty of achieving it. our efforts to measure the exact often fail because the world is not always clearly structured .the poem seems to imply   that the only thing that is certain and has an exact number is death.