Question

In a sample of 500 families, 90 have a yearly income of less than dollar-sign 40,000, 200 have a yearly income of dollar-sign 40,000 to dollar-sign 80,000, and the remaining families have a yearly income of more than dollar-sign 80,000.


a. Suppose one family is randomly selected from these 500 families. Find the probability that this family has a yearly income of less than 40000

b. Suppose one family is randomly selected from these 500 families. Find the probability that this family has a yearly income of more than 80000

Answer 1

Possibly B, I'm not sure.

Answer 2

To start this you will need to first find out how many have an income of more than $80,000.

Answer 3

its two different questions..

Answer 4

Then take however many families have that income over the total number of families. For example 200/500=.4. Now move the decimal to the right 2 times and you know that 40% of families have an income between $40,000 and $80,000.

Answer 5

Do you understand that?

Answer 6

yes, thank you

Answer 7

Your welcome.