Flight TaxiOut Times Use the relative frequency distribution from Exercise 28 in Section 22 to construct a histogram. If the quality of air traffic procedures were improved so that the taxiout
times vary much less, would the histogram be affected?
Solution 18BSC
In a relative frequency distribution, the relative frequency for a class obtain by dividing the corresponding class frequency with the total of all the given frequencies in that distribution and the resultant is multiply with 100%.
From the given information, the relative frequency distribution for the times required to taxiout for takeoff (in minutes) is
the times required to taxi out for takeoff (in minutes) 
Frequency 
Relative frequency 
10 – 14 
10 

15 – 19 
20 

20 – 24 
9 

25 – 29 
1 

30 – 34 
2 

35 – 39 
2 

40 – 44 
2 

45  49 
2 

Total 
48 
100% 
The constructed Histogram for the above relative frequency distribution is as follows:
From the above histogram we can see that the taxiout times vary much less, if the quality of air traffic procedures were improves so that the histogram is also affected.