Question

In 1900, the average life expectancy in the United States was 47.3 years. In 2015, the average life expectancy was 78.8 years. Calculate the percentage increase in life expectancy from 1900 to 2015

Answer 1

Find the difference of the average life expectancy in 2015 and 1900:

78.8 − 47.3 = 31.5 years.

Compute the percentage increase in life expectancy from 1900 to 2015:

The increase in life expectancy is about 67%.

Step-by-step explanation:PLATO

Answer 2

66.6%.

Explanation:

We have been given that in 1900, the average life expectancy in the United States was 47.3 years. In 2015, the average life expectancy was 78.8 years.

We will use percent increase formula to solve our given problem.

`\text{Percent increase}=\frac{\text{(Final value-Initial value})}{\text{Initial value}}* 100\%`

`\text{Percent increase}=(78.8-47.3)/(47.3)* 100\%`

`\text{Percent increase}=(31.5)/(47.3)* 100\%`

`\text{Percent increase}=0.665961945* 100\%`

`\text{Percent increase}=66.5961945\%`

Round to nearest tenth.

`\text{Percent increase}\approx 66.6\%`

Therefore, the percentage increase in life expectancy from 1900 to 2015 is 66.6%.