Relative frequency distribution and cumulative frequency distribution
Annual Income

Number of Households

Under $10,000

20

$10,000under $20,000

45

$20,000under $30,000

70

$30,000under $40,000

30

$40,000under $50,000

15

$50,000under $60,000

12

$60,000under $70,000

8

Total

200

1. What is the frequency of the $20,000 under $30,000 class?
a.20
b.45
c.75
d.30
2. What is the width of each class?
a. $20,000
b. $5,000
c. $60,000
d. $10,000
3. What is the midpoint for the $40,000  under $50,000 class?
a. $45,000
b. $40,000
c.$42,000
d. 15
4. If we were to convert these data a relative frequency distribution, what value would be linked with the $50,000  under $60,000 class?
a. 0.96
b.0.06
c. 0.04
d.0.12
5. For a cumulative frequency distribution (less than or within), what value would be linked with the $30,000  under $40,000 class?
a.30
b.35
c.165