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.

MATLAB: An Introduction with Applications
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shows a frequency distribution of the weekly wages of 65 employees at the P&R Company. 

 

                         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 percentage employees earning less than $280.00 per week.
  • The percentage employees earning less than $300.00 per week but at least $260.00 per week.
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