The breakdown of U.S. cities having a population of at least 10,000 persons has been reported as follows.
|
Population
|
Number of cities
|
|
10,000-under 25,000
|
1476
|
|
25,000-under 50,000
|
664
|
|
50,000-under 100,000
|
407
|
|
100,000-under 250,000
|
182
|
|
250,000-under 500,000
|
37
|
|
500,000-under 1,000,000
|
23
|
|
1,000,000 or more
|
9
|
a. How many cities have a population of at least 25,000 but less than 500,000?
b. How many cities have a population less than 250,000?
c. How many cities have a population of at least 100,000 but less than 1,000,000? What percentage of cities are in this group?
d. What is the class mark for the 100,000-under 250,000 class?
e. Convert the table to a relative frequency distribution.