Question

Problem 1

The distribution of ages in the United States in the year 2010 is given below. Intervals include the left endpoint but not the right; the number of people aged 100 or more was not zero but it was so small that it makes no difference to the table. You can assume that the ages are uniformly distributed within each interval.

Answer 1

Look again at the distribution of ages in Problem 1.
a) About what percent of the people were in their thirties? Round your answer to one decimal place.

b) A common (though not universal) definition of "senior citizen" is "person over the age of 65". About what percent of the population were senior citizens? Round your answer to one decimal place.

Answer 2

sorry i am really bsy ..wait for someone else to reply

Answer 3

The key to doing this problem is interpreting
You can assume that the ages are uniformly distributed within each interval.

that means you can divide up the interval 30 to 45 into 15 chunks (each represents 1 year)
People in their 30's will occupy 10 of the 15 chunks, and we can say 10/15 of the entire interval are people in their 30's.

the 30-45 interval is 19.8 % of the population. People in their 30's will be 2/3 of this
or 2*19.8/3 = 13.2%

Answer 4

Can you use the same idea to figure out what percent are over 65 ?
It will include the people 75-100, 6.0%
and part of the interval 60-75
you have to figure out what fraction of the 60-75 group are "over 65"

Answer 5

Thanks