How did the average life expectancy change between 1850 and 2020?

Question

BlackTom AI · Accepted Answer

Life expectancy rose from roughly 35 years in 1850 to about 75 years in 2020, an increase of 40 years.

Relevant concepts:
- Life expectancy at birth is the average number of years a newborn is expected to live under current mortality conditions. Changes reflect public health, medicine, nutrition, sanitation, and social conditions.
- Calculating change uses simple subtraction: change = value in later year − value in earlier year.

Step-by-step reasoning and calculation:
1. Identify the approximate average life expectancy in 1850. Historical estimates place worldwide (and many national) life expectancies around 30–40 years; here we use 35 years as the representative 1850 value.
2. Identify the average life expectancy in 2020. Contemporary figures are around 70–80 years globally or for many countries; here we use 75 years as the representative 2020 value.
3. Subtract the 1850 value from the 2020 value:
   - 2020 life expectancy = 75 years
   - 1850 life expectancy = 35 years
   - Change = 75 − 35 = 40 years
4. Optionally express the relative change: (40 / 35) × 100% ≈ 114% increase relative to the 1850 baseline.

Why the correct answer is correct:
The numeric subtraction directly yields a 40-year increase. This magnitude is consistent with historical records showing large gains in average lifespan due to reduced infant/child mortality, vaccinations, antibiotics, improved sanitation, and better nutrition and medical care over the past 170 years.

Why the other choices are incorrect:
- “About 20 years” and “about 15 years” are far too small compared with the observed improvement from mid-19th century to 2020.
- “About 30 years” underestimates the increase by roughly 10 years compared with the representative 35→75 example above.

Conclusion: The increase between 1850 and 2020 is about 40 years, matching the provided correct answer.

How did the average life expectancy change between 1850 and 2020?Single choice

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