Table1
Wages
Number of employees
250.00 - 259.99
8
260.00 - 269.99
10
270.00 - 279.99
16
280.00 - 289.99
14
290.00 - 299.99
10
300.00 - 309.99
5
310.00 - 319.99
2
Total
65
With reference to this table, determine:
The lower limit of the sixth class.
The upper limit of the fourth class.
The class mark (or class midpoint) of the third class.
The class boundaries of the fifth class.
The size of the fifth-class interval.
The frequency of the third class.
The relative frequency of the third class.
The class interval having the largest frequency. This is sometimes called the modal class interval; its frequency is then called the modal class frequency.
The lower limit of the sixth class is 300.00.
The upper limit of the fourth class is 289.99.
The class mark (or class midpoint) of the third class is (270.00 + 279.99) / 2 = 274.995, rounded to 275.00.
The class boundaries of the fifth class are 289.99 - 0.01 = 289.98 and 299.99 + 0.01 = 300.00.
The size of the fifth-class interval is 299.99 - 290.00 = 9.99.
The frequency of the third class is 16.
The relative frequency of the third class is 16 / 65 = 0.246, rounded to 0.25.
The class interval having the largest frequency is the second class (260.00 - 269.99) with a frequency of 10.