TABLE 2-5
The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier.
-Referring to Table 2-5, what is the cumulative relative frequency for the percentage of calls that lasted 10 minutes or more?
A) 0.16
B) 0.24
C) 0.41
D) 0.90

Question

TABLE 2-5
The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Table 2-5, what is the cumulative relative frequency for the percentage of calls that lasted 10 minutes or more?
A) 0.16 
B) 0.24 
C) 0.41 
D) 0.90

Quizplus · Accepted Answer

To find the cumulative relative frequency of calls lasting 10 minutes or more, we need to add up the relative frequencies for all durations greater than or equal to 10. 
Relative frequency of calls lasting 10 minutes or more = 0.25 + 0.16 + 0.10 + 0.07 + 0.02 + 0.01 = 0.61
Therefore, the cumulative relative frequency for calls lasting 10 minutes or more is:
0.61 + 0.29 = 0.90
So, the best choice is C.

TABLE 2-5 The Following Are the Duration in Minutes of a Sample