14

The test results from a group of employees from a factory are represented in the following table:

  fi
[38, 44) 7
[44, 50) 8
[50, 56) 15
[56, 62) 25
[62, 68) 18
[68, 74) 9
[74, 80) 6

Draw the histogram and the cumulative frequency polygon.


  fi Fi
[38, 44) 7 7
[44, 50) 8 15
[50, 56) 15 30
[56, 62) 25 55
[62, 68) 18 73
[68, 74) 9 82
[74, 80) 6 88

Histogram