The breakdown of U.S. cities having a population of at least 10,000 persons has been reported as follows.

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.

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Population Number of Cities 10,000-under 25,000 25,000-under 50,000 50,000-under 100,000 100,000-under 250,000 250,000-under 500,000 500,000-under 1,000,000 1,000,000 or more 1510 684 430 191 37 25