Relative frequency distribution and cumulative frequency distribution
|
Annual Income
|
Number of Households
|
|
Under $10,000
|
20
|
|
$10,000-under $20,000
|
45
|
|
$20,000-under $30,000
|
70
|
|
$30,000-under $40,000
|
30
|
|
$40,000-under $50,000
|
15
|
|
$50,000-under $60,000
|
12
|
|
$60,000-under $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