The median age of the u. s. population in 1980 was 30.0 years. in 1991, the median age was 33.1 years.
a. what does it mean for the median age to rise?
b. give two reasons why the median age could rise.
c. for the median age to rise, is the actual number of children less in 1991 than it was in 1980? why or why not?

a. Life span increased

b. The median age could rise because of the improvement in medical technology. Also more advertisement of healthier life styles, such as eating healthy could have increase the median age.

c. No because this just shows the increase in life span not the decrease in children.

Step-by-step explanation:

a. more people on average lived longer lives. (explanation)

b. self explanatory I guess, my answer pretty much explained it.

c. life span of US citizens does not effect the children population. I guess you could say people lived longer lives to have more children, so possibly the number of children could have increased.

you never say the total so we cant find the percentage used for petrol

step-by-step explanation: